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Old 03-21-2002, 03:16 AM   #1
twitch
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Thumbs up GReddy EVO Cat-Back Exhaust

Got one for my WRX from German AutoWerks for a song. I installed it in a little under an hour. Sounds great. Had a bit of vibration on the rear heat shield near the gas tank; bent it up out of the way. The GReddy fits way snug under there, especially by the rear differential (if you have the protector cover). Anyone else have any problems with it fitting almost too tight & snug? What did you do to fix it? Good thing I didn't get the Cusco exhaust hangers; it certainly would be making some serious contact. Another question: did anyone use the stock bolts or the ones the GReddy came with? I used the new ones & the connection between the rear cat & the mid-pipe is sealed but there is about a 1/4 inch gap between the two flanges. Normal? Final comment: it would have been sweet for GReddy to include some instructions. I was able to figure it out though.

v/r
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Old 03-22-2002, 02:14 PM   #2
twitch
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Talking GReddy Update

I fixed my heinous exhaust vibration problem. I removed a bolt from the rear differential skid plate cover that was hitting the mid pipe. I also swapped out the stock exhaust hangers with some longer cheapy ones from Pep Boys. Now the exhaust has the proper clearance & spacing from the heat shields & underside of the car. My spine is slowly coming back around. The exhaust sounds awesome. Hp increase? Don't know. It seems to pull a little better. It's probably all in my cranium. B.L.: Thumbs up on the exhaust & German Autowerks.
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Old 03-26-2002, 02:34 AM   #3
Rexkid
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Default yeah thumbs up

I just finished installing the greddy and the sound is perfect!! Not loud at all, but a nice deep burble. just a touch louder than the mrt turboback I had awhile ago but MUCH quieter than borla or scoobysport.
Had some serious problems trying to get the catback in with some kartboy hangers which resulted in some whacky smacking on the rear diff protector and heat shield. Just used 2 of the oem hangers for the front two hangers and used the kartboy to keep the muffler super stable. Then removed the bolt off the diff protector. so now it is PERFECT.... sweet set up. I notice a bit less lag on the turbo and much less decel when I let off the throttle. anyone know where i can get a good 3rd cat replacement pipe?
Oh and beatiful muffler, only one nicer lookin is the hks titanium and thats a bit too bling bling for me...

thanks!!
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Old 03-26-2002, 02:47 AM   #4
imprezaGDA
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i jus recently put this set up on too. and im gettin the same problems as u guys. except i dont have the rear diff. protector... so all i have to do is bend the heat sheild then? I love it too. It a great nice throaty sound but not too ricey either. Now im jus waitin for the HKS downpipe to come out.
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Old 03-26-2002, 02:12 PM   #5
potouli
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Default removal of heat shield?

I was even thinking of removing the exhaust heat shield by the diff protector. would that be a bad idea??
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Old 03-26-2002, 04:59 PM   #6
potouli
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Default talked to greddy

I had a long chat with Greddy today and followed their install tips, and reinstalled the catback with no probs. Since I never go offroad I opted to remove my rear diff protector. then i used kartboy hangers for the midpipe and two for the can. then used the stretchy oem hanger to mate the rear of the muffler to the midpipe. this setup is perfect and produces no rubbing and very little exhaust movement. Can't wait to hook this up to a vishnu downpipe and 3rd cat replacement pipe!!!
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Old 03-27-2002, 02:45 AM   #7
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My EVO exhaust will arrive at my home tomorrow BTW where did you guys get Kartboy hangers? I can't wait to install it.
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Old 03-31-2002, 05:47 AM   #8
samowrx
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gwt them from straight from the source, kartboy.com
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Old 04-01-2002, 09:00 PM   #9
SubyObsessive
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hey guys how big is the tip on the muffler???

-dan
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Old 04-02-2002, 03:44 AM   #10
wrx2
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115mm, around 4.5in. It looks very nice on WRX's rear bumper. I love my EVO!
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Old 04-13-2002, 07:58 PM   #11
SoLiDbReAkZ
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Just installed mine!! Wow---what a difference!! This is the way it should have sounded from the factory! Not too loud, just a nice subtle bass tone at idle--and beautiful at WOT! About the 1/4" gap at the front: I had that too. I just used a pinch of liquid gasket sealant with the provided solid gasket, tightened all the bolts like crazy (and used threadlock), and fastened it all on with Kartboy hangers.

I DID run into a couple of problems though:

1. The heat shield near the rear diff. wasn't agreeing with my hammer and hands (cut myself four times) trying to reshape it to fit the 3.14" piping. Therefore, I removed the sucker. Is it really that necessary that I have the shield there?

2. I had to remove the diff. protector to get the piping to fit well. The four long 17mm bolts on the side of the diff protector plate did NOT fit back into the holes. I know there were smaller ones before the dealership put the protector on. The plate surrounding the pre-diff assembly itself IS held on my about four other bolts forward of these holes. Can I drive the car tonight with these four smaller 17mm bolts absent? (I'm gonna pick them up tomorrow morning.)

Last edited by SoLiDbReAkZ; 08-13-2002 at 06:01 PM.
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Old 04-15-2002, 10:54 PM   #12
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I have another problem:

Ever since I put the EVO on the car seems to be a bid slower, particularly on the low-end (seems to take longer for the turbo to spool), and somewhat even on peak boost. There is a slight (1/4") gap between the flanges of the Greddy 2nd mid pipe and the Stock front mid-pipe. The Stock cat pipe ends in with a narrowing taper (wherever the term is called). The GReddy exhaust is a flat flange. The taper DID fit into the greddy pipe--and seemed to make a rather complete seal, but I wanted to be absolutely sure. I used liquid gasket sealant around the flanges, and tightened the bolts till my bones almost broke. I also used Loctite on all the bolts. The rear flanges bet. the 2nd (GReddy)midpipe and the muffler pipe are SEALED totally with the supplied gasket in between... I dunno what the problem is..

Could the larger diameter piping be to blame??

Anyone else having this problem??
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Old 04-16-2002, 01:07 AM   #13
imprezaGDA
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Well i dont have my car w/ me right now cuz its at the dealer.....but when i got my exhaust i didnt feel a noticable diff. in HP. While other people that got the Stromung cat-back said they did. Maybe hadnt driven the car long enough to feel it. I dont know...i thought i had gotten a pretty good feel of it.

Bryant
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Old 04-16-2002, 11:10 PM   #14
parrej
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Default solution to some of your problems

I just finished installing my greddy evo exhaust last night. I ran into some of the same problems as most of you. One thing that I have been reading is about the 1/4" gap. There is a rubber donut washer that tapers down on the stock cat. If you use a putty knife that ring comes off. If you take that off and use the provided washers that come with the exhaust, it fits tight. If you have any questions feel free to email me.

Sincerely,

Jon
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Old 04-17-2002, 10:26 AM   #15
twitch
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Question Who would have thunk?

That tapered thing on the end where my new exhaust meets up is actually a rubber ring? Who would have thunk? It seemed like it was metal. I got a good seal even with it there; although there is a big goofy gap. I guess I'll fix it this weekend.

Did anyone reuse the stock bolts (the ones inside the valve springs)? I ran with the ones that came with the GReddy because they were longer & covered that huuuge expanse of a gap.

Thanks for the tip. Putty knives rule!

v/r
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Old 04-17-2002, 01:34 PM   #16
SoLiDbReAkZ
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Putty knife?? What about a sharp regular knife?? That taper..It looks like a combo of metal mesh and another substance..I dunno. Mine (I assume) makes a good seal too, but I'd much rather have the confidence of knowing that those flanges lines up. HEY GREDDY???!! INCLUDE INSTRUCTIONS FOR INSTALL!!!!

Has anyone noticed that with the exhaust the car has more lag??

I dunno...it used to start boosting for me at lil' less than 3k...now almost 3500k. Feedback pleez.
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Old 04-17-2002, 01:40 PM   #17
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Is that due to an possible exhaust leak in that front area?? or just that I have 3.14'' piping with a stock engine?? LOL...hmm..
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Old 04-17-2002, 05:51 PM   #18
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hey solid

could be a few things...

did you reset the ECU? if you didn't, the ecu settings are not ideal for the extra flow.

with a larger diameter exhaust, you will loose some torque on the bottom end. if you feel your loosing power accross the power band it is something else. turbo's loooove less back pressure, and you should feel noticable power increases on the top end. when i went full catless, i did notice the very bottom end was crepy slow. i got used to it tho, and eventually learned to drive around it. i recently went back to full stock (cep the uppipe) and got a bunch of low end back. but that is a poor trade off for the extra hp you get everywhere else (IMHO).

you couyld have a leak, but you would hear it, big time. i have 2 leaks at the moment, and they sound like shreaking cats. when the car warms upm the ppes get biger and seat better, and the noise goes away. small leaks, but leaks none the less. i am getting them fixed when the vf 22 gets in

hope this helps...

josh
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Old 04-18-2002, 12:56 AM   #19
SoLiDbReAkZ
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The car doesn't feel THAT slow . But that lil' zing of surge around 3-4k is basically gone. Acceleration is more linear...flat. Still quick, but my butt dyno senses some lost low and mid range power. You are correct, however, as the car seems less "out of breath" near redline. The increased lag is bothering me though . Guess I'm gonna have to wait for that Vishnu Stage Zero I've been saving for. Hopefully the exhaust, when combined with their uppipe and downpipe, and a lil tuning will again put a big and dumb smile on my face.

Anyway, I'm gonna put the rex on ramps this Sat and replace the heatshield and cut out that tapering donut at the end of the stock catted mid-pipe. Who knows, maybe I have a leak..the exhaust DOES sound a little too loud during mid-rpm decel. I'll post back when I fix everything and do an ECU reset. Thanks 4 the help guys!!
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Old 04-24-2002, 01:12 AM   #20
clckwrkrnj
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Default

For those interested in this exhaust, here's a video / sound clip.
http://homepage.mac.com/jjlee/wrx/greddy.mov
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Old 04-27-2002, 10:52 PM   #21
SoLiDbReAkZ
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I took off that confounded donut thing at the cat and bolted the EVO back up. Very clean bolt-up...READ: NO GAPS!! I tried to re-install the heat shield, but over torqued one of the rear bolts and it SNAPPED!! Well, I checked the tank and surrounding area (axle etc...), and there was absolutely NO sign of heat stress.. so I guess I'm OK until I order a new bolt. I'm disconnecting the battery overnight for a clean ECU reset. Everything seems cool. Again, thanks for the help guys!!
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Old 04-29-2002, 02:12 PM   #22
twitch
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Default Mmmm...Doughnuts!

SoLiDbReAkZ inspired me to crawl under my WRX & remove my exhaust doughnut. Like SoLiDbReAkZ, mine sealed up like a champ. While down there, I took the opportunity to slap in the Kartboy solid droplinks (also worked like a champ). I also removed my rear differential cover (was sick of the occasional whacking of the EVO into it). If there is anyone in Las Vegas who needs a differential cover, please drop me a PM.

On the downside, one of the cheapo PepBoy hangers was tearing so I put the stock one back on; I can't wait till my KartBoy hangers get here.

Tonite, my ZeroSports splitter goes in. My Tarmacs should be here tomorrow. A good week for WRX installs.

v/r
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Old 04-29-2002, 02:47 PM   #23
clckwrkrnj
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let me know how the kartboy hangers fit with the greddy exhaust. I'm afraid that it might be too tight.

thanks
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Old 05-03-2002, 01:08 AM   #24
karazyman
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I just got mine on the car today... fine and dandy.

I didn't use the provided gaskets. I just straight bolt on with the provided screws and everything is fine.

thinking about getting the hangers tho... kinda swings a bit.


anyways... i Like i like
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Old 05-03-2002, 03:27 AM   #25
supermarkus
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Quote:
Originally posted by SoLiDbReAkZ
II'm disconnecting the battery overnight for a clean ECU reset. Everything seems cool.
No need for an overnight disconnect. Just disconnect your negative terminal and go step on the brake to bleed the rest of the juice out of the electrical system, takes a couple of seconds and your ecu is reset. Good enough for Shiv, good enough for me.
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