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Old 08-03-2004, 10:02 AM   #1
mrbigisbudgood
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Question My wagon = too loud.

Dilema. I'm tired of hearing my wagon drone and resonate in my teh cabin. Helix DP and Borla Hush, Cobb Stage 2. I'm thinking about putting the factory catback back on it. I'm 30 with 2 kids and I'm just not into the loud obnoxious car thing anymore. The car sounds great, everyone comments on how good it sounds, I'm just tired of the noise.

I have two questions.

#1 - How much power will I loose by putting the factory cat-back back on the car? 10? 15hp? I will obviously still run Stage 2 and do a hard reset on the ECU and let it learn around the new restriction.

#2 - Is there anything quieter than the Borla in a twin tip. I've seen people say that Prodrive is quieter, but haven't seen any real data supporting that claim.

TIA
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Old 08-03-2004, 10:04 AM   #2
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OR.......

Go to a Cobb catted TBE? I'd like to see some Db data on this system.
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Old 08-03-2004, 10:12 AM   #3
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Real data:

http://forums.nasioc.com/forums/show...hreadid=447182

Get a Prodrive oval tip, it is quiet and not drony in a wagon.

<------catless Prodrive wagon owner
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Old 08-03-2004, 10:15 AM   #4
BryanH
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Just a thought but have you put any sound deadening in the back of the car?

just a thought....
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Old 08-03-2004, 10:20 AM   #5
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UB - I knew all that data was there, but it's all "at idle" which is not where my annoyance is comming from. It's in the 2800-3500 rpm range during normal driving. I wish there were more WRX owners around here so I could hear the Prodrive in person. Best of luck with Alex, I was unfortunate enough to live in Richmond when Isabel came rolling through.

BH - Does it make that much of a difference?
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Old 08-03-2004, 10:26 AM   #6
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sound deadening will make a difference.

I know you said you want some real proof, but...

all I can offer is that I have a prodrive oval and with all the cats in place, it is too quiet.
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Old 08-03-2004, 10:30 AM   #7
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Quote:
Originally Posted by mrbigisbudgood
I'm 30 with 2 kids and I'm just not into the loud obnoxious car thing anymore.
To answer #2, I would say there is nothing quieter that will make you any happier with the sound. I have a borla hush and helix dp on my wagon and I don't think it's loud at all. A friend of mine has the prodrive with helix dp and his car is either louder or about the same as mine.
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Old 08-03-2004, 12:04 PM   #8
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mrbigisbudgood - Is your helix catted or un-catted?
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Old 08-03-2004, 12:14 PM   #9
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I don't think you'd be losing much power by adding the factory catback. My guess is about 3-5HP. When I put on my axleback muffler (the prodrive, by the way), I really didn't notice a bit of power increase. Granted it's an axleback vs. a catback. I remember reading in "DRIVE", the mag. Subaru sends you once a month or so, that the SPT Catback they added to a WRX netted like 7 HP or so.
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Old 08-03-2004, 12:36 PM   #10
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Quote:
Originally Posted by Unabomber
Real data:

http://forums.nasioc.com/forums/show...hreadid=447182

Get a Prodrive oval tip, it is quiet and not drony in a wagon.

<------catless Prodrive wagon owner
Well mine is catless with the Prodrive oval tip muffler and it drones on the highway, so apparently the definition of drone varies with age. Once you are completely catless with no resonators, it does not matter how quiet the muffler is - it will drone.

I am having the same exact dilemma as Mrbig (over 30, kids on the way) and am considering two options:

1) Having a hi-flow cat welded to the Scoobysport midpipe that is currently on the car.
2) putting the stock front midpipe with cat back on the car.

I like the sound, but can't deal with the drone or smell.

Jimbo
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Old 08-03-2004, 12:42 PM   #11
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Quote:
Originally Posted by Jimbo
Well mine is catless with the Prodrive oval tip muffler and it drones on the highway, so apparently the definition of drone varies with age. Once you are completely catless with no resonators, it does not matter how quiet the muffler is - it will drone.

I am... considering two options:

1) Having a hi-flow cat welded to the Scoobysport midpipe that is currently on the car.
2) putting the stock front midpipe with cat back on the car.

I like the sound, but can't deal with the drone or smell.

Jimbo

That's what I was thinking, & it's why I asked if mrbig is catless.
If he wants he could also keep his Borla Hush and get a short catless DP and run his factory 3rd cat in between. I think that would be less restrictive than switching to the stock catback.
I don't know about anybody else, but after seeing how thin the piping is on the stock axleback, I am never putting that thing on my car again unless it's inspection time or unless I'm selling the car.
-Vin
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Old 08-03-2004, 12:48 PM   #12
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stick a cat or a resonator in there somewhere, or buy a new mid or down pipe with a resonator/cat. Or take your stock DP if u still have it and gut the cat and leave the resonator. I donno about the fitment of the stock parts to ur aftermarket stuff tho so maybe thats not an option.
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Old 08-03-2004, 01:00 PM   #13
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I've got the scoobysport DP with cat-back (kept factory third for SCCA STX regs). Very pleasant from idle through cruising. Not intrusive until you hit about 4K
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Old 08-03-2004, 01:27 PM   #14
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I'm un-catted, and I have a gutted up to install possibly this weekend.

Is the SPT catback essentially the STi exhaust? Or am I completely wrong? (edit....it's made by Bosal) I'm gonna look into that right now. Maybe the STi catback is the ticket, that's a system that obviously supports 300hp.

Putting the stock DP back on the car is out of the question. I think that would just be murder on the Stage2 software with the flat plate at the turbo and I'd be just as well off running it Stage1. I want and enjoy the Stage2 power/drivability.

Keep the ideas flowing guys, this is helping quite a bit.

Last edited by mrbigisbudgood; 08-03-2004 at 01:33 PM.
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Old 08-03-2004, 01:49 PM   #15
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I have the Bosal (i.e. SPT) single-tip catback. Bolting that up to your existing setup will NOT help. It will still be loud - trust me on that.
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Old 08-03-2004, 01:59 PM   #16
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the Greddy Evo2 is pretty quiet. no droning with my Bosal DP, and 3rd cat. i'm getting a Helix UP and DP soon (waiting for UPS) and i can let you know how it sounds. from reading various posts, it seems like the Hush drones when catless.
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Old 08-03-2004, 02:25 PM   #17
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coming from experience ive got an 02 wagon with tons of dynamat in the trunk, APS 2.5" catted TBE. and its F'in loud. outside of the car it actually seams less loud than inside the car. I had my aps tbe with the Stock 04 sti muffler, I dyno'd with that setup at 245 @ the wheels. Slapped on this APS muffler and noticed no gains In HP whatsoever. will probably switch back to the sti muffler, im tired of getting too much attention, but i will miss the burbling and spitting..
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Old 08-03-2004, 02:30 PM   #18
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Here's another vote for plumbing in a resonator. Pick up one of the Magnaflow or Dynomax 4" round mufflers and weld it in the same spot the factory resonator would be, should cut down on drone a good amount without affecting flow/power any detectable amount.
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Old 08-03-2004, 02:41 PM   #19
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i have a stage 2 cobb wrx wagon with txs stealthback and prodrive exhaust. when i did my audio system i put soundeadening(raammat) on most panels of my car. two layers in the doors, 2 in the roof and 1 layer in the trunk. i thought the soundeadening quitened the ride quite a bit. the raamat in the trunk and rear door lessened the exhaust noise quite a bit and the soundeadening in the roof and the doors cut down on road noise quite a bit too.

if i were you i would try that. i know it'll help for sure but im not sure for what extent for you.
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Old 08-03-2004, 03:16 PM   #20
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If your just looking to get rid of resonance and you have a 3" exhaust do this:
1. go to www.speedwaymotors.com
2. do a search for "auger muffler"
3. buy the 3" version
they are $15 and are designed for drag racing where the track has db limits.
They slide into the pipe at the last flange before the muffler.
I have a buddy who uses these in his bracket racer and I use one for my WRX wagon. While it won't drop huge dbs off your exhaut volume it will remove any resonation.
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Old 08-03-2004, 03:17 PM   #21
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I was running catless with a 3" Brullen catback system. It drove my wife, dogs, and neighbors crazy. Droning inside my wagon especially 60mph cruising was rediculous. You will definitely go insane on long road trips. It was also difficult tuning my car as I cannot hear detonation. Well so much for that...

My current exhaust system consists of 2 Moroso Spiral Flow Racing Mufflers and 1 Dynomax Super Turbo Muffler. At less than 200 bucks, my exhaust system is now quieter than stock, droning gone and all I hear is road noise from my tires, the usual gear whine and the whoosh of my turbo. My ears, wife, dogs and neighbors are happy now

I probably lost less than 10 whp but that is nothing with a Stage 4+ setup. Anyone wants to buy a 3.5" dual-tip 3" Brullen muffler?
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Old 08-03-2004, 03:29 PM   #22
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The MRT twin-tip is one of the quietest I've heard - especially with the resonated center pipe and catted downpipe. You are pretty much committed to an entire system as the flanges are all 3" and the dp is longer than stock.

When I had my car dynoed, Shiv said I could gain an additional 5-10 hp over what I have by going to an even less restrictive back section. I replaced my twin-tip with the MRT 'Cannon' muffler which is almost too loud for my tastes, even with the silencer in. Fortunately, I don't drive on the street that much anymore.

-Keith-
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Old 08-03-2004, 04:33 PM   #23
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Quote:
Originally Posted by drwrx
If your just looking to get rid of resonance and you have a 3" exhaust do this:
1. go to www.speedwaymotors.com
2. do a search for "auger muffler"
3. buy the 3" version
they are $15 and are designed for drag racing where the track has db limits.
They slide into the pipe at the last flange before the muffler.
I have a buddy who uses these in his bracket racer and I use one for my WRX wagon. While it won't drop huge dbs off your exhaut volume it will remove any resonation.

This looks very cool and is certainly affordable to try out. How does it stay in place within the pipe? Thanks!
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Old 08-03-2004, 05:24 PM   #24
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Doesn't that thing obstruct flow?
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Old 08-03-2004, 10:25 PM   #25
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I have a stock STi axle-back on my wagon and it is quiet.

Larry
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