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Old 08-23-2012, 10:21 PM   #1
xluben
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Default xluben's Greddy Racing Ti-C Single Exit Cat Back Exhaust Review



I have a 2011 WRX. It has a 20G XTR and is tuned on E85. It also has a built motor and built transmission, as well as full bolt on's. But I was still running the stock cat back exhaust! I've tried other exhausts in the past, but I've ended up back on the stock exhaust due to the sound. It dyno'd at 460+ WHP with the stock exhaust. Here is a link to more info on the car:

http://forums.nasioc.com/forums/show....php?t=2078765

All the other exhaust I've tried in the past were quad tip style. The midpipes were between 2.5" and 3". Based on road dyno logs I didn't see any difference in power in these setups, but the sound changed considerably. All were deemed too loud, and due to the lack of a performance increase I eventually got rid of them.

Eventually I decided I should try a single exit, straight through exhaust to see what it would do. I figured that if this style didn't add any power, nothing would. When looking at exhausts of this style I originally was going to get the Invidia N1, but I wasn't a fan of the fact that it was designed for the single exit hatch, so it exits at the side of the bumper cutout and often burns/melts it.

Eventually I came across the Greddy Ti-C and decided to give it a try. It does not seem to be very well known, but it appears to be very high quality and has gotten good reviews from the people that actually do have it. In terms of the single exit offerings it appears to be one of the nicest ones available. I ordered it from RallySportDirect and I was very eager to get it.

http://www.rallysportdirect.com/Gred...st-Single-Exit

EDIT: The exhaust is back on a Group Buy!

http://www.rallysportdirect.com/Group_Buy



Hardware/Build: The Greddy Ti-C catback for the 08+ STI and 11+ WRX hatchback is a single exit exhaust with a can style muffler (ie. "N1" style). It has minimal bends for the smoothest flow possible, but does include a resonator in the midpipe to reduce drone. The exhaust is made of mandrel bent, 80mm (3.15"), 304 stainless steel. The exhaust tip is made of titanium and has a "burnt" look.





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Old 08-23-2012, 10:22 PM   #2
xluben
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The craftsmanship of this exhaust is excellent. The materials are great and the design seems very good. The bends in the piping are all extremely smooth. The welds look impeccable. The thick, solid flanges look like they will last for a very long time. The muffler is polished to a mirror finish, and the tip has the "burnt Ti" look. This exhaust also includes all hardware (gaskets, nuts, bolts) for installation, as well as an exhaust silencer, which comes installed inside the muffler (more on this later).







Compatibility: This exhaust fits the Subaru STI 2008-2012 Hatchback and WRX 2011-2012 Hatchback (ie. hatchbacks with the factory quad tip exhaust). The hangers will line up with an 08-10 WRX hatchback, but the muffler will not fit into the cutout (it will hit the side). You could modify either the exhaust (bend hangers or piping) or the car (cut a larger hole in the bumper) to make it fit, but it is not a direct bolt on for a non widebody 3G WRX hatch.
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Old 08-23-2012, 10:22 PM   #3
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Silencer: Before installing the exhaust I removed the silencer, you could also do this while the exhaust is on the car. To do so you first need to remove the 3 allen head bolts from the base of the exhaust tip. Then the tip itself can be removed. At this point the silencer can be removed but it is a tight fit. To get it out you can use a slide hammer, or you can try to wiggle it out by hand.

I chose to pull it out by hand. The key is to try and get it out as straight as possible. If it gets crooked it will get wedged in place and hard to move. You can also use an allen key or screwdriver into the welded on nut(s) and use that to pull it out. I just wiggled it out by hand. It was not very difficult, but if the silencer has been installed for a long period of time it may be harder to do.

Once you have the silencer out, you need to reinstall the tip. The bolt holes will only line up in one orientation. The "GReddy" logos should be on the sides, and rightside up. You will need to use the 3 allen head bolts and the 3 loose nuts. Tighten them down and you're ready to go!









Installation: On the correct car (08+ STI or 11+ WRX Hatch) the exhaust will bolt right up. It uses the OEM hanger locations, including the one on the midpipe and the two on the passenger's side rear of the car. It does not use the two hangers on the driver's side because the muffler is so much smaller. To install, you will first need to remove whatever cat back exhaust you currently have installed. Undo the two bolts holding the midpipe to the downpipe, and then pull it off the hangers. With a little bit of muscle this should be a very simple/quick task.

Next, preassemble the Greddy Ti-C catback by bolting the midpipe and muffler sections together. Use the included gaskets and hardware to do this. You could mount each item and then bolt it together, but I have found it to be easier to install it all as one piece. Note that the included gaskets are slightly different sizes. Use the larger one on the rear joint. Once you have it assembled, slide all the hangers into their appropriate locations and then bolt the exhaust to the downpipe. The Greddy Ti-C exhaust is designed so that it can be used with either the OEM style donut gasket (assuming the downpipe is flanged for this), or a 3" flat gasket for most aftermarket downpipes. This makes installation very simple with just about any setup.

On The Car: The exhaust bolted up perfectly to my Invidia Catless Downpipe using the included 3" flat gasket. All of the hangers and flanges lined up great and there are no leaks. The tip is nicely centered in the bumper cutout and is not so close that it will melt anything (I used the stock hangers).

The single exit, burnt tip looks great. It is different than the stock quad tips, so not everyone will like it, but if you want an aggressive look, I think this does it. The other nice thing about a single exit is that it weighs much less than a full size muffler and quad tips. The stock cat back weighs 43lbs and the Greddy only weighs 27lbs, which is a pretty good weight savings!





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Old 08-23-2012, 10:22 PM   #4
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Sound: This is the important part for a lot of people! The sound from this exhaust is great! It is definitely louder than anything I've had in the past, at just about any RPM, but it's not as overbearing as something like the N1 Race. At cold idle it is very boomy and loud, but once it warms up it is not too bad when idling. Around town it can get pretty loud when accelerating up to speed. Lower RPM's, under load seem to be a loud point. Cruising it is not overly loud, but it is noticeable. Under WOT this exhaust really shines. It has a nice deep tone and plenty of it. Describing the sound in words is difficult to do, so here are a few videos of it:




Power: Closing out with this topic because it was one of the main reasons I wanted to try an exhaust like this. The single exit, high flow design was thought to have the possibility of increasing my power output. To test this I did road dyno logs before and after installing the new exhaust and then compared them in Virtual Dyno. The logs on the stock exhaust were done a week or two prior to the new exhaust. There were no other parts changed (other than the cat back).



This plot shows great results from just changing the cat back! Above about 4.5k RPM's there are approx. 25WHP and 25WTQ gains all the way to redline! Minor fueling tweaks were made to the tune to make sure the AFR's were the same, but the boost and timing were left the untouched. For just changing a cat back, this is a very nice result to see. I don't know if the gains would translate to a lower powered setup, but on my car the exhaust really seemed to have freed up some top end power.

Conclusion: I am very happy with this exhaust! It is very well made and fitment is perfect. The single exit design is a decent weight savings over the stock exhaust, and the unrestricted flow results in a nice power gain. The sound is a bit louder than I normally prefer, but it is not terribly loud. I may try the silencer in the future, but right now I'm very happy with it! I would recommend this exhaust for anyone who is trying to get the most power out of their car, or just wants an aggressive look/sound with great quality and fitment.

I bought mine from RallySportDirect. They have great service and support and very quick shipping. Their knowledge and helpfulness is the best I've found. I would highly recommend them for any purchase! Here is a link to the exhaust I have:

http://www.rallysportdirect.com/Gred...st-Single-Exit

EDIT: The exhaust is back on a Group Buy!

http://www.rallysportdirect.com/Group_Buy

FYI - These are the exhaust systems I've had on my car in the past, in chronological order:
  • Stock
  • SPT
  • Invidia Q300
  • Stock
  • Tsudo Quad Tip
  • Stock
  • SPT
  • Stock
  • Greddy Ti-C
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Old 08-23-2012, 10:22 PM   #5
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Update: I installed the silencer a little while ago!



Swapping over is a breeze. I used an allen key and 8mm socket with ratcheting wrench (just like when I removed it). I have found that it's best to put the socket onto the nut and then turn the bolt with the allen key. It will ratchet the wrench without actually using the wrench (because if you try to use the wrench inside the exhaust tip, it will bang around).

Once I had the tip off I slid the silencer in and re-installed the tip. The silencer has the bolts welded in, so you don't need to use the loose bolts or the socket/ratchet. The whole swap probably takes 10 minutes or so. Nothing difficult at all. But maybe if you go along time it will eventually be hard to remove the tip and/or install/remove the silencer. But for me it was easy and quickly completed.

Then I turned the car on. It was already pretty warm and I immediately noticed the difference in sound. It was extremely quiet! This exhaust is a two headed beast! Totally different sound level with the silencer vs. without. Idle sounds damn near stock and so does everything else. It is a huge change. It's quieter than any other exhaust I've had on besides stock. It still has a nice sound and I think it's a little louder than stock, but not much.

Idle is quiet, cruising is quiet, WOT sounds good, but it's quiet, and there is zero highway drone. I need to try and get a video of this! The difference is quite remarkable. One "downside" is that my tranny and BOV seem way louder now, haha. I barely noticed the first gear whine with the loud exhaust, but now the whine is very obvious. I guess I can't really fault the exhaust for this.

The Greddy silencer looks quite a bit better than the Invidia, which has the small pipe sticking through the baffle. The Greddy has a tapered baffle at the end of the pipe and it sit's at the base of the exhaust tip (pretty far in). It is a lot less noticeable. I'm guessing that once some black buildup gets on it, you won't even see it in there.



I've never actually used a silencer before, but I figured they didn't do much. Maybe they all work this well and I just had no idea. My only concern is exhaust flow and power. Stuffing all the exhaust out of a 2" diameter hole (or maybe even smaller), can't be good, but hopefully it's not that big of a difference because it's so far downstream.

I would hope that it does at least as good as the stock exhaust, but I think it would still be better than that and end up somewhere between the stock exhaust and the Greddy with no silencer. I'll have to pull a few logs sometime soon and do a comparison. If it makes good power, and is this quiet, I will be very happy!

Update 2: Here is a video of the silencer.


It sounds a LOT quieter in real life than it does in the video. The video makes it seem like it's nearly as loud as without the silencer! But if you listen closely you can tell that there is a lot less rumble at idle and even when revving the tone is a little different. You really can't tell just how much quieter it is from the video, but it really is a LOT quieter with the silencer.



The auto leveling on my microphone makes it all sound about the same loudness, but you can really notice that after revving it almost sounds like the car is off (silent), that's because of how quiet it really is. Highway drone is completely gone and cruising around town sounds nearly like stock. It still has a great sound, even though there is a lot less of it.



I still need to do some testing on how much power the silencer steals from me, but in the sound department I really like it. It's great for going around town. Very subtle but has a nice sound if you get on it. I'm hoping it makes at least similar power to the stock exhaust. Then I'll probably just leave the silencer in for commuting and take it out for spirited driving.



I would also note that these photos make the silencer look very visible. In real life it's much less noticeable. These photos are all taken laying flat on the ground (you can see me in the reflection of the last photo). When walking around the car I doubt most people would even see it. It will be especially hard to see once it gets covered in soot from driving around for a while.

Update 3: I did some logging, and I don't think I'm going to be keeping the silencer on. I was having trouble logging, so I was only getting logs up through 4-5k rpm's and then they were cutting out, but after looking over my partial logs some more and talking with my tuner, I decided it's not really worth it for me. With the silencer installed I was losing 1.5psi of peak boost and going 0.5 points richer in AFR, which means there is some serious restriction going on!

My logs only went out to just below 5k rpm's but even at that point it was already down close to 60WHP! If I had to guess I think it would probably be about that much drop all the way up through redline. So the car was probably down to close to 430WHP peak. Definitely a huge drop from what it was at with the Greddy and no silencer (and even a step down from the stock exhaust).

It was down by maybe 10WHP prior to peak boost (compared to the Greddy without silencer). Peak torque was also down by about 60ft-lbs. The logs cut out right about where peak torque occurs, so I think this is an accurate peak number. As you can see, the silencer shifted the whole powerband down, and anything after spool up, it shifted down a LOT.

Now if I had gotten retuned and pushed the boost back up, and leaned the AFR back out, I probably could have gotten quite a bit of that power back. Maybe I could get it into the same ballpark as with the stock exhaust, but I don't have an AP so I'm not switching tunes when I throw in the silencer, and it's a big enough change that it would be less than ideal to install the silencer with the current tune.

Even if I could swap tunes easily I don't think I would want to try and push the power back up because that's it's just going to be making everything work harder. My turbo is already being pushed, and bumping it up to try and compensate for a restrictive exhaust doesn't seem like a good choice. I may install it for long trips if I want it quiet and don't car about power, but I don't plan on using it for romping around town.

Now I'm not sure how much it would change power in a stock turbo setup, but I know that for my car it does not look like a good every day option. I don't plan on using it very often, if ever. If someone on a stock turbo wanted to test it out I would be interested in seeing the results! The silencer is really quiet, and still sounds good, but I don't think it's worth the performance drawbacks.

Last edited by xluben; 08-26-2012 at 04:47 PM.
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Old 08-23-2012, 11:07 PM   #6
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Great write up. If I had seen this before purchasing my N1 Race, I may have had to re-consider.
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Old 08-23-2012, 11:17 PM   #7
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sexy

greddy makes nice stuff
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Old 08-23-2012, 11:50 PM   #8
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Dammit, i almost bought one of these a while back when greddy was selling them for like 350. Would've brought my bank account to its knees then, but i kinda wish i had
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Old 08-24-2012, 12:19 AM   #9
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Great review! Can you comment as to if there is any drone when cruising on the highway around 70 or so? That's an important detail that wasn't really touched on. Thanks!
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Old 08-24-2012, 12:25 AM   #10
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One of the best write ups ive read in really long time.
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Old 08-24-2012, 12:32 AM   #11
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Quote:
Originally Posted by 2011SatinSTI View Post
Great write up. If I had seen this before purchasing my N1 Race, I may have had to re-consider.
If you really want loud, then the N1 Race is probably going to be your best bet. The lack of a resonator should increase the sound output quite a bit. The main thing I don't like about the N1 is that it was designed for the single exit bumper, so it sits off to the far edge of the quad tip bumper cut out and can melt the plastic.

Quote:
Originally Posted by Celery GT-5 View Post
sexy

greddy makes nice stuff
Yes, I agree. It looks like super high quality.

Quote:
Originally Posted by SWP is Sexy View Post
Dammit, i almost bought one of these a while back when greddy was selling them for like 350. Would've brought my bank account to its knees then, but i kinda wish i had
Well, the Group Buy is super good pricing right now!

Quote:
Originally Posted by explainyourface View Post
Great review! Can you comment as to if there is any drone when cruising on the highway around 70 or so? That's an important detail that wasn't really touched on. Thanks!
Yeah, I only touched on that briefly. The drone when cruising is not that bad. Probably less than the Q300 (although that is known to be a bit drone-y). You can hear it while cruising, but it's not horrible. BUT if you start to accelerate or are going up a hill, then it gets pretty loud. More-so than the quad tips I've had. It's not a quiet exhaust, but it's something I could definitely life with (my wife on the other hand...).

Quote:
Originally Posted by sleepyGV7 View Post
One of the best write ups ive read in really long time.
Thanks! There are still a couple things I'd like to add, so hopefully it will be updated soon.
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Old 08-24-2012, 05:11 AM   #12
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Any outside vid of driving around? That is super cheap for an exhaust, but I'd have to get a ELH because I hate the boxer rumble haha.

That 40-100 pull is impressive dude. Reminds me of my Cobra.
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Old 08-24-2012, 08:03 AM   #13
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Sweet exhaust....pure sex!
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Old 08-24-2012, 10:34 AM   #14
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any chance we can get a clip and dyno with the silecer in? lol
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Old 08-24-2012, 11:13 AM   #15
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Any outside vid of driving around? That is super cheap for an exhaust, but I'd have to get a ELH because I hate the boxer rumble haha.

That 40-100 pull is impressive dude. Reminds me of my Cobra.
I don't have any outside video. That is one of the things I still wanted to do. If you don't like the rumble, this probably isn't the exhaust for you. It certainly does make a lot of noise.

Quote:
Originally Posted by uspopo View Post
Sweet exhaust....pure sex!
Thanks.

Quote:
Originally Posted by Celery GT-5 View Post
any chance we can get a clip and dyno with the silecer in? lol
Yeah, that's another thing I want to do. One of these days...
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Old 08-24-2012, 11:18 AM   #16
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if the silencer makes that thing bearable on the highway I might have to get one..lol
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Old 08-24-2012, 11:21 AM   #17
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Hmmm...if the power gains are real...do I swap out my GReddy SP Elite for this? Weight and money savings...although I love the look of my SP Elite.
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Old 08-24-2012, 11:29 AM   #18
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Quote:
Originally Posted by Celery GT-5 View Post
if the silencer makes that thing bearable on the highway I might have to get one..lol
Yeah, I'm curious how it will sound...

Quote:
Originally Posted by rsutton1223 View Post
Hmmm...if the power gains are real...do I swap out my GReddy SP Elite for this? Weight and money savings...although I love the look of my SP Elite.
If you do, you should do back to back dyno pulls on an actual dyno for confirmation.
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Old 08-24-2012, 04:18 PM   #19
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Quote:
Originally Posted by xluben
I noticed this taper here ^^ Does it taper down to a 2.5" donut style gasket like the other GReddy catbacks?
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Old 08-24-2012, 04:54 PM   #20
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Yes. It can be used with the stock downpipe and donut gasket or a 3" DP and flat gasket.
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Old 08-24-2012, 05:42 PM   #21
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No leaks? I had a leak problem with my GReddy SE catback bolted onto an Invidia DP, requiring me to buy Grimmspeeds adaptor.
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Old 08-24-2012, 07:49 PM   #22
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No leaks? I had a leak problem with my GReddy SE catback bolted onto an Invidia DP, requiring me to buy Grimmspeeds adaptor.
Nope. I even started the car and crawled back under to check.
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Old 08-24-2012, 10:05 PM   #23
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Good deal. Looks great, sounds amazing, and you had decent gains. I'm sure it's purdy durn loud! How does it sound with the silencer installed?
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Old 08-24-2012, 10:21 PM   #24
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Originally Posted by RoadKillDMD View Post
Good deal. Looks great, sounds amazing, and you had decent gains. I'm sure it's purdy durn loud! How does it sound with the silencer installed?
I haven't tried the silencer yet, but I will soon!
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Old 08-24-2012, 10:29 PM   #25
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