I got an 06sti with a deadbolt 20g turbo with all the supporting mods... I have an invidia v2 dp with a catless vibrant 3inch exhuast.. Would it benifit me to put a 4inch exaust from the catback??? Also would that make it sure more flames than it already does... thanks

 

Are you running a BOV, if so thats most of your cause of shooting flames. As for 4 inch, I believe stickin with 3 inch is perfect still for your setup!

 

First off, are you tuned? Shooting flames is not a good thing. Personally, I think a three inch exhaust should be fine. If you feel like you need bigger, APS makes a 3.5 inch and that should more than suffice.

 

yeah im running a turbo xs type h bov, and yes it has a custom tune done by boxer4racing

 

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.

 

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

 

Who makes a 4" exhaust anyway?

 

get it

 

TurboXS downpipe is 4"

 

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

 

lol dont all the DPs are 4 inches other than HKS??? but it goes back to 3 later on anyway.

 

No problems here with my AC drain hose when it was on my wrx for over 3 years

 

I think the TurboXS is the only bolt-on 4" downpipe (i.e. not custom fabbed)....APS makes a 3.5". 3" is the standard size and works fine.

 

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.

 

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 UTEC is outdated but when using a JDM ecu you can use only ECUtek or UTEC.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.