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Old 07-15-2007, 01:19 AM   #1
mxpunk
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Default most hp made on stock exhaust?

Or more importantly, what are the limitations of the stock exhaust on the 2.0 motors?

Im using a complete wrx exhaust for my impreza 1.8T aside from an ERZ up pipe and am wondering if the stock d/p will be too restrictive..

but ive heard tht the cats only become a restriction @ 300+ whp

my long term goal for this car (not this motor) is 315ish awhp but i want to keep the exhaust stock cause I like it quiet..dont wanna attract any attention.

Thanks
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Old 07-15-2007, 07:40 AM   #2
The Blue Pilot
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I think if you were to go with some quiet sounding exhaust then you should be fine...

Else go with the stock muffler and catless.
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Old 07-15-2007, 07:46 AM   #3
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I did 230hp/265 lb-ft through the stock 3rd cat and intermediate pipe. I don't believe the stock intermediate pipe becomes much of a restriction until you swap turbos, which you'll definitely be doing to hit your goal.

Have you ever heard a car running a stealth-back to the stock muffler? It would probably be worth looking into.
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Old 07-15-2007, 09:40 AM   #4
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I'm running the stock dp/mp catless with an sti axleback - perfect combo imo as its very free flowing and not very loud. Has a nice low rpm grumble to it

My goal is right around 300-350 hp/tq eventually and the only thing I will probably change is the downpipe to better match the exhaust housing of the turbo I get.
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Old 07-15-2007, 10:39 AM   #5
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Quote:
Originally Posted by TurbojonLS View Post
I did 230hp/265 lb-ft through the stock 3rd cat and intermediate pipe. I don't believe the stock intermediate pipe becomes much of a restriction until you swap turbos, which you'll definitely be doing to hit your goal.

Have you ever heard a car running a stealth-back to the stock muffler? It would probably be worth looking into.
nope, got any sound clips?
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Old 07-15-2007, 11:00 AM   #6
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I think this is a great thread!

I have often wondered what kind of power could be made just on a reflash alone.

Also, upgraded turbo with a stock exhaust and a reflash.

AFAIK nobody has done that yet.
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Old 07-15-2007, 02:31 PM   #7
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well.......i will probably be getting a erz down pipe but i will let you guys know what i make on my 1.8T when i hit the dyno in a few weeks (stock mid pipe and axleback)
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Old 07-16-2007, 09:02 PM   #8
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bump..
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Old 07-16-2007, 10:33 PM   #9
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I run a VF34 turbo on the Cobb map (UP, catless DP, STI injectors) into a stock STI catback. I drove my friend's car who has the same setup but with a full 3" exhaust and didn't feel a difference. I'm sure that there is some difference on a dyno but I felt no noticeable difference in the seat of my pants. Other's opinions may vary.
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Old 07-18-2007, 06:16 PM   #10
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Quote:
Originally Posted by scooby1220 View Post
I run a VF34 turbo on the Cobb map (UP, catless DP, STI injectors) into a stock STI catback. I drove my friend's car who has the same setup but with a full 3" exhaust and didn't feel a difference. I'm sure that there is some difference on a dyno but I felt no noticeable difference in the seat of my pants. Other's opinions may vary.
that is good to know. the 3" was louder though..right? which must of meant it was faster!

btw, whats the ID of the sti mid pipe? 2.5 inches??

thanks for telling me that though. i want my car to be fast but dont want to attract attention from v8 ****, ricers and police..
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Old 07-19-2007, 02:46 AM   #11
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Quote:
Originally Posted by scooby1220 View Post
I run a VF34 turbo on the Cobb map (UP, catless DP, STI injectors) into a stock STI catback. I drove my friend's car who has the same setup but with a full 3" exhaust and didn't feel a difference. I'm sure that there is some difference on a dyno but I felt no noticeable difference in the seat of my pants. Other's opinions may vary.
That is good to know.. i just recently went with a vf39 and supporting mods (already had a 3" tbe from stg 2) and i was/am shocked at how much louder the exhaust got. I've been thinking stock axelback to quiet it down, but sti catback is an idea i haven't thought of yet.
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Old 07-19-2007, 03:50 AM   #12
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I would think that you can get a resonable amount of peak power through a stock exhaust but using an aftermarket will greatly change your power delivery...More torque/h.p. in some areas,so the car will definately feel better...
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Old 07-19-2007, 07:33 AM   #13
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I'm at 300whp, and I switch from 3" to stock catback a lot, and I can't feel a bit of difference. One is just a lot louder........
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Old 07-21-2007, 07:58 PM   #14
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nooooooiceeee

this is my car..and she will break 315 awhp and sound like a stocker!


thanks for the help guys its much appreciated
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Old 07-22-2007, 03:17 AM   #15
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if your goal is 315 awhp then itll b to your advantage when you take the time and money that itl take to get there, get some big pipes with some resonators and a quiet muffler

im running a good amount of bolt ons with stock catback to keep queit, and its restrictive at alot les then 315awhp
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Old 07-22-2007, 11:58 AM   #16
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Quote:
Originally Posted by Zackbo View Post
I'm at 300whp, and I switch from 3" to stock catback a lot, and I can't feel a bit of difference. One is just a lot louder........
Keep an eye on your gauges lately? I wonder if your EGT`s go up or not...
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Old 07-22-2007, 01:36 PM   #17
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Quote:
Originally Posted by AlboWRX View Post
Keep an eye on your gauges lately? I wonder if your EGT`s go up or not...
Good question. I ended up disconnecting my EGT probe when my EGTs were so low (1200f range) after installing headers and WI, that it didn't seem worth monitoring. Before they were in the 1800f range under load. I have seen a 'little' less MPG with the stock catback; maybe 2-3 mpg less on average.
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Old 07-22-2007, 02:52 PM   #18
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It`s always good to monitor the egt`s. You never know what could happen...
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Old 07-22-2007, 04:27 PM   #19
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Over here the police are cracking down on loud exhausts, so last week i had to show up at the policestation with a legal muffler.

I have a 2.5 inch downpipe, midpipe and Blitz Nur-Spec on the car normally.
I had to mount the factory muffler for the test at the police-station, and ever the 5 mile drive made it clear to me the car didn't like it one bit.
Lethargic, feeling castrated and not happy.
A full factory system i believe would be even more of a performance killer

Specs
98 GT-Turbo
FMIC, MBC , TD04 @ 1.5 bar.
A car running lower boost would suffer less i think, but the OEM system is a major performance killer.
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Old 07-22-2007, 10:37 PM   #20
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Quote:
Originally Posted by Dutch Scooby lover View Post
Over here the police are cracking down on loud exhausts, so last week i had to show up at the policestation with a legal muffler.

I have a 2.5 inch downpipe, midpipe and Blitz Nur-Spec on the car normally.
I had to mount the factory muffler for the test at the police-station, and ever the 5 mile drive made it clear to me the car didn't like it one bit.
Lethargic, feeling castrated and not happy.
A full factory system i believe would be even more of a performance killer

Specs
98 GT-Turbo
FMIC, MBC , TD04 @ 1.5 bar.
A car running lower boost would suffer less i think, but the OEM system is a major performance killer.
you know, back in my dirt bike riding days a louder bike always felt faster...i doubt your car was THAT much slower..
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