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Old 08-14-2003, 04:38 PM   #1
essogas
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Join Date: Apr 2003
Location: Toronto, Ontario
Vehicle:
2004 WRX STi
Blue/British Black 18's

Default Who changed their Sti Stock exhaust already?

I would like to hear from people who have already taken this step, not from those who are thinking, exploring or speculating what route to take. If you have made the change, what type/brand did you choose and what advantages and disadvantages has your exhaust modification had on the general performance of the car?
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Old 08-14-2003, 05:22 PM   #2
ShagnRS
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Default HKS Carbon-Ti Catback

Replaced the stock exhaust with the HKS Carbon-Ti catback. Pretty much a direct bolt up except you have to shim the hell out of the spring bolts (Don't re-use the springs). Take up the extra slack created by the spring removal with a spacer over the bolt, or just washer it up.

Better breathing (Not a whole lot, it's only a catback) up top. A little loss down low...so just don't get caught down low (< 2000 rpm).

Love the sound. Low gutteral burble, nice at WOT as well. No droning observed.

One thing you may want to consider though. The Carbon-Ti is the same as the Hi-Power from HKS. The Hi-Power is cheaper. You could use the extra dough to by a down-pipe and run more HP than those of us with the Carbon-Ti Catback system
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Old 08-14-2003, 06:06 PM   #3
awilson529
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I dont have it on yet... but I got a TXS turbo back.
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Old 08-14-2003, 06:30 PM   #4
horshack
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I have a BPM TBE, the TwisterIII.

HUGE difference!

BTW - Don't forget to make the ECU relearn with the new exhaust!

I will have Dyno results on 8/31.

The BUTT Dyno says BIG gains!
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Old 08-14-2003, 07:19 PM   #5
happasaiyan
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Default

Quote:
Originally posted by horshack
BTW - Don't forget to make the ECU relearn with the new exhaust!
hmm...i never reset my ECU after i did my exhaust...which was probably 700 miles ago. do you think it has relearned by now? or should i just go out and do a reset now. i didnt want to lose my stereo settings, so i just left it alone. is there power or tuning to be had if i do reset? thanks in advance.
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Old 08-14-2003, 07:23 PM   #6
horshack
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Quote:
Originally posted by happasaiyan


hmm...i never reset my ECU after i did my exhaust...which was probably 700 miles ago. do you think it has relearned by now? or should i just go out and do a reset now. i didnt want to lose my stereo settings, so i just left it alone. is there power or tuning to be had if i do reset? thanks in advance.
Depends if the ECU had already completed the learn function prior to your exhaust install. How many miles on the car when you completed the exhaust upgrade?

If its a cat-back, I would just leave it alone.

If its a TBE and your car already learned prior to install, then I think you will be more than happy re-programming those radio stations!
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Old 08-14-2003, 07:27 PM   #7
happasaiyan
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i had about 2500 miles on it when i did the TBE. doesnt the ecu constantly relearn? so in theory it wouldve learned now what it should learn by resetting it?
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Old 08-14-2003, 07:28 PM   #8
happasaiyan
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either way though...i have to go pick up my mbc today after i get home. ill adjust the mbc to 16psi (its already boosting more than that, so lets cross our fingers and see if it will at least somewhat limit my boost creep problem), and then reset it after that. we shall see!

the problem isnt so much the radio stations....but its more the audio settings (bass, treble, mids, etc). stupid complicated stereos. haha.
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Old 08-14-2003, 07:31 PM   #9
horshack
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Quote:
Originally posted by happasaiyan
i had about 2500 miles on it when i did the TBE. doesnt the ecu constantly relearn? so in theory it wouldve learned now what it should learn by resetting it?

How many radio stations do you have???????????

I would bite the station programing bullet and reset that ECU.

Make sure you search on the proper way to reset also!
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Old 08-14-2003, 07:48 PM   #10
SGOSWRX
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I have Godspeed downpipe and an Greddy EVO catback. That makes my exhaust catless. I can definately feel a good seat in the pants increase in power. I'm waiting to get a boost gauge installed so I can put my high performance boost controller on the car.
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Old 08-14-2003, 08:12 PM   #11
awilson529
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Just did a search on how to reset the ECU and found no usefull results. SO... how do you do it?

Thanks in advance,
Adam
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Old 08-14-2003, 08:47 PM   #12
Wombat North
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Quote:
Originally posted by awilson529
Just did a search on how to reset the ECU and found no usefull results. SO... how do you do it?
Disconnect the battery, step on the brake pedal 1/2 a dozen times during a period of 30 seconds to drain all the power then reconnect the battery. Done

Last edited by Wombat North; 08-14-2003 at 08:52 PM.
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Old 08-14-2003, 09:02 PM   #13
horshack
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Quote:
Originally posted by Wombat North


Disconnect the battery, step on the brake pedal 1/2 a dozen times during a period of 30 seconds to drain all the power then reconnect the battery. Done

Or Disconnect the battery for 30 min.
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Old 08-14-2003, 09:59 PM   #14
awilson529
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thanks guys
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Old 08-14-2003, 11:36 PM   #15
peczenij
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Put on my TurboXS cat back from my 2002 WRX.
It was like removing a cork. Lots more power.
I cannot believe it...
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Old 08-15-2003, 01:11 AM   #16
bert_WRX
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Default

Quote:
Originally posted by peczenij
Put on my TurboXS cat back from my 2002 WRX.
It was like removing a cork. Lots more power.
I cannot believe it...
what he said...
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Old 08-15-2003, 02:52 AM   #17
euroauto
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Changed out at 17 miles, Invida turboback and K&N short ram. WOW! Might be a bit loud so I'm putting the stock muffler back on with a custom made flange. jim
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Old 08-15-2003, 04:32 AM   #18
wpcalvin7
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I just ordered the B&B triflow exhaust, I will keep you guys posted when I install the exhaust, should sound pretty awesome.
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Old 08-15-2003, 10:33 AM   #19
Hummer
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Quote:
Originally posted by peczenij
Put on my TurboXS cat back from my 2002 WRX.
It was like removing a cork. Lots more power.
I cannot believe it...
You are correct sir!
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Old 08-15-2003, 10:51 AM   #20
lstepnio
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I keep seeing people commenting on with boost spiking/creaping after the exhaust installs. I'm curious to see some more people with gauges to comment regarding this issue.
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Old 08-15-2003, 11:43 AM   #21
happasaiyan
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Default

Quote:
Originally posted by lstepnio
I keep seeing people commenting on with boost spiking/creaping after the exhaust installs. I'm curious to see some more people with gauges to comment regarding this issue.
will be attempting to resolve this issue later tonight when installing my TXS HPBC. im thinking i may have to cap boost to 15psi. i dunno. well see though.

...but yes, it is a problem at ~140 in 6th. BAM boost cut + CEL. peaks out at 1.3bar.
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Old 08-15-2003, 12:01 PM   #22
lstepnio
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I assume you're going to be taking the FBC out of the equation w/ the MBC?
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Old 08-15-2003, 12:20 PM   #23
happasaiyan
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im going to be trying a few things...
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Old 08-15-2003, 03:50 PM   #24
zacek
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APS Turbo back here along with APS 65 mil. intake.

Tremendous overall improvement. Boost increased to 15.5psi, I have EGT, A/F and BOOST gauges. I forgot to reset ECu and car backfired (or afterfired) constantly for a couple of days after installation but eventually went away. The gauges now register normal activity after 2 days. I am estimating @ least 20 hp increase on ButtDyno!

It has been about a month now and no CE lights from Exhaust nor from intake. No droning, a little loud @ WOT since this turbo-back was actually designed for the 2 litre WRX, never got this loud on the WRX.
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Old 08-15-2003, 03:57 PM   #25
dsmperformance
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1991 TSi

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Full Invidia system here...


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