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Old 07-08-2003, 04:40 PM   #1
CruWRX
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Member#: 9675
Join Date: Aug 2001
Location: Winnipeg, Manitoba
Vehicle:
2004 04 STi
Aspen White

Default Turbo Back Exhaust ?s

Has anyone done a tubro back exhaust for the STi yet? Do you get any good gains? do you lose Hp and tourqe? The Turbo XS exhuast claims they get about 27 more hp and about 13 more tourqe. Any info would be great. Now back to some more research! Thanx
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Old 07-08-2003, 05:20 PM   #2
MTMS4
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Join Date: Mar 2001
Location: Rochester, New York, USA
Default

I think doing some basic research will reap big dividends.

A couple of important things to consider are noise level ("straight-through" exhausts will produce more power and generally more noise)....this can be real tiring if it's your daily driver.

Where do the advertised power gains occur and are these gains at the expense of removing some/all of the cats or replacing them with high-flow cats which MAY not last as long or meet emission standards depending on their quality and design ? (not a good or responsible idea for day-to-day street use in my humble opinion).

If you're going to mod the car to much higher power levels anyway (i.e much higher than the stock figures) you will probably need a full 3" (at least) turbo-back exhaust. If not, just be careful about what you choose and why. I added a 3" cat-back exhaust to my modified S4 (~320 bhp and 365 lb/ft torque) and whilst it opened up the power delivery at > 5000 RPM I lost a noticeable amount of low-end torque....which, for me, compromised stop-and-go daily driving.

The new Turbo XS RFL-Ti exhaust with the straight-through muffler (the one which gives the 28 hp gain) is EXTREMELY loud (compared to stock) by all accounts.....but again this is all relative and the noise gain may be totally acceptable to you.
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Old 07-08-2003, 06:19 PM   #3
metoo
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Chapter/Region: TXIC
Location: Houston
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2004 STi sold :(
forizzle

Default

The TXS TBE with Ti muffler maybe loud, but one must understand that the video displays the catless TBE. The cat muffles the noise quite a bit. So if you don't go catless, your's won't be as loud. The 27hp gain was made with cat.
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Old 07-08-2003, 07:14 PM   #4
MTMS4
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Default

I agree, but some of the threads I've read are for the high-flow-cat equipped version of the turbo-back..........and people have said it is VERY noisy compared to standard.
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Old 07-08-2003, 07:20 PM   #5
STiLL WILL
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Member#: 37581
Join Date: May 2003
Location: Correct Fitment Crew #38
Vehicle:
2004 SZ55'd STi
375whp on 91/404whp on 95

Default cat or no cat equipped turbo back?

will getting a high flow cat equipped with the turbo back system also cause a check engine light on the STi?

-STiLL
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Old 07-08-2003, 08:59 PM   #6
Hummer
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Join Date: Jan 2003
Location: KC
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2004 STi
Silver

Default

I have the TurboXS RFL TI with high flow cat and a Perrin short ram and it is loud if you get on it. If you keep it around 2k it is ok though.

The performance of this car makes me giggle.
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Old 07-08-2003, 09:02 PM   #7
Hummer
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2004 STi
Silver

Default Re: cat or no cat equipped turbo back?

Quote:
Originally posted by STiLL WILL
will getting a high flow cat equipped with the turbo back system also cause a check engine light on the STi?

-STiLL
I can only speak for my car. I have zero problems with the perrin short ram and turboxs rfl ti{except for a few stares if I am stretching my legs}.
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Old 07-08-2003, 09:22 PM   #8
supermarkus
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Location: Edmonds, Washington, USA
Vehicle:
2008 WRX STi
SSM

Default

ask rlavalle about his Hayward and Scott turbo back, it sounds amazing. Just like a rally car minus the ALS.
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Old 07-09-2003, 01:41 AM   #9
hatchy
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Location: North West
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2004 STI

Default

I did the Invidia downpipe and the HKS carbon TI exhaust recently and the gain is significant. No dyno, sorry, but above 4000 rpm, the car really screams. Didnt notice any loss in torque down low. It is louder than stock, but it does not drone on the highway. However, it does growl when you take off from the stop light if you don't take it easy. You'll want to short shift if you see the po po.
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Old 07-09-2003, 02:13 AM   #10
silver ghost
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Silver

Default

Quote:
Originally posted by supermarkus
ask rlavalle about his Hayward and Scott turbo back, it sounds amazing. Just like a rally car minus the ALS.
where can i get them and for how much?

also, does anyone have sound clips of the Hayward and Scott turbo back?

thanks, Ghost
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Old 07-09-2003, 02:25 AM   #11
supermarkus
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Member#: 6971
Join Date: May 2001
Location: Edmonds, Washington, USA
Vehicle:
2008 WRX STi
SSM

Default

Go to www.rallyperformance.com and look around for their Scooby Sport exhaust page, the sound clip should be the Hayward and Scott/Scooby Sport turbo back. H&S and Scooby Sport have since parted ways but you can still get the H&S system direct or from Rally Performance.
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Old 07-09-2003, 02:41 AM   #12
silver ghost
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2004 WRX STi
Silver

Default

dam!! that exhaust does sound incredible....and 29hp gain is awesome with that kind of sound...mighty tempted to jump in on this one...

Ghost
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