4inch exhaust. good or bad?>?

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Sep 24, 2007 | 10:04 PM

#16

VIBEELEVEN

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iTrader: (2)

Joined: Oct 2004

Posts: 5,120

From: Napa, Ca.

Car Info: 03 WRX

Quote:

Originally Posted by Evil Empire

I am going to run UTEC on my impreza. UTEC is outdated but when using a JDM ecu you can use only ECUtek or UTEC. what I am going to do is have my ecu flashed with ecutek first then later on instal and have the utec tuned so I can have the benifits of the Utec and the reliability of the Ecutek.

What about Hydra?

Sep 25, 2007 | 05:49 PM

#17

subie OCD

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iTrader: (11)

Joined: Aug 2005

Posts: 5,808

From: Concord

Car Info: 04 STi

Edit.

Last edited by subie OCD; Sep 25, 2007 at 07:53 PM.

Sep 26, 2007 | 11:23 AM

#18

TRONN

Registered User

Joined: Jun 2006

Posts: 28

From: CARSON

Car Info: 05 STi WRB/GOLDD

i have the stealthback and it's 4" at the turbo and it gets massive flows! Although, it tapers down to 3" in the end

4" is too big IMO, but will come in handy when u go really big!

Sep 27, 2007 | 03:24 PM

#19

Beef

Registered User

Joined: Jun 2006

Posts: 17

From: San Pedro, CA

Car Info: 05 STi WRB/Gold

Quote:

Originally Posted by GripItUp

A 4inch would be way too big, too much air would be let loose from the motor. You need that back pressure to support the "push" you get from the motor.

WTF???

3" will be fine. For turbo really the bigger the better. Its just whether or not you can deal with the noise.

Oct 4, 2007 | 05:16 PM

#20

JamesGRrallye

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Posts: 457

From: Carlsbad,CA/Athens,GR

Car Info: 2001RSTI

Even 3 in os overkill unless ure turbo is off a Kenworth. Cats stop the flames! Running catless means a lil flame poppin is inevetable but depending on the length of the burst could mean ur runnin rich.

Nov 1, 2007 | 08:56 PM

#21

subie OCD

Registered User

iTrader: (11)

Joined: Aug 2005

Posts: 5,808

From: Concord

Car Info: 04 STi

Quote:

Originally Posted by GripItUp

A 4inch would be way too big, too much air would be let loose from the motor. You need that back pressure to support the "push" you get from the motor.

Quote:

Originally Posted by PikkaGTR

agree nice top end but tq will suffer on the low end

Quote:

Originally Posted by highwayman

Overkill. Say goodbye to the AC drain hose & wrap it well.

Quote:

Originally Posted by TRONN

4" is too big

Where are you guys getting all this bunk information from?? I had NO issues or problems with the 4" downpipe.

For all the naysayers here is my 2004 STi, road tuned by Ed @ eq tuning:

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Name: EQtunedsti.jpg
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Size: 105.6 KB

Mods:
2004 STi
TurboXS turbo back with cat and standard muffler
APS turbo inlet hose
APS TGV deletes
Walbro fuel pump
SPT heat shield & trimmed stock shield
SPT radiator shroud

APV1 EQ custom road tune, CA 91 octane.

294 tq @ 4050 rpm
272 hp @ 5930 rpm

For the record Eds road dyno software rates stock STis at 215-225whp and he even commented that my car was really strong for a catted setup.

I also had no problems on my ecutek tune by Mike with the same exhaust on my old stage 2+ bugeye.

Quote:

Originally Posted by VIBEELEVEN

That tapers to what though?

You can't use txs components with other brands though. That makes it lame as **** in my opinion and is the reason nobody uses then anymore. I can't name anyone that uses a UTEC anymore.

My exhaust is a 4" downpipe, 3" midpipe, high flow cat and 2.5" axleback. It flows tons and is quiet. And whos talking about the UTEC?? If you dont want to tune yourself dont buy it! This exhaust is 3yrs old, fits perfect and sounds great. Im sorry you have issues with TurboXS.

In the end -- A PIPE IS A PIPE! As long as it flows, fits and sounds the way you like it, you cant really go wrong with an aftermarket exhaust.