Can I put an STi cat-back on my 06 WRX?

LXguy · 07-26-2007, 05:48 PM

Hey All:

Looking for a quiet upgrade to my WRX. Will an STi stock catback bolt up?

Thanks

Steve

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kilfarsnar · 07-26-2007, 06:02 PM

AFAIK it will bolt up. But it is not really an upgrade. The pipe diameter is the same. So without a downpipe you will not see any performance increase. even if you were to get a DP and EM it is still no different than the stock exhaust.

I looked into doing this with my wagon. But I abandoned the idea after researching.

The Deliverator · 07-26-2007, 06:06 PM

Yes.

Easiest question ever

The Deliverator · 07-26-2007, 06:07 PM

Quote:

Originally Posted by kilfarsnar

AFAIK it will bolt up. But it is not really an upgrade. The pipe diameter is the same.

Wrong.

The midpipe may be the same diameter, but the axleback portion is 2.5" instead of 2.25".

It's better.

Matt_H · 07-26-2007, 06:47 PM

It's only .25" bigger then stock from the axle back. You will see maybe .005 hp gain.

silverey3 · 07-26-2007, 08:02 PM

if ur formula is right then full 3" pipe = 0.015 hp gain

....

Matt_H · 07-26-2007, 08:13 PM

Sounds about right.

Pain++ · 07-26-2007, 09:49 PM

Quote:

Originally Posted by silverey3

if ur formula is right then full 3" pipe = 0.015 hp gain

....

truth, since it's a CBE....no gains to be had there....

silver-duck · 07-26-2007, 11:27 PM

It will work great; with cobb dn. pipe sound and power are great; 287hp / 320torque[ see proven power]I have 06 wagon

kilfarsnar · 07-27-2007, 12:08 PM

Quote:

Originally Posted by The Deliverator

Wrong.

The midpipe may be the same diameter, but the axleback portion is 2.5" instead of 2.25".

It's better.

Cool, thanks for the info. But over the stock WRX exhaust, it's still not much of an upgrade is it?

Matt_H · 07-27-2007, 12:12 PM

Not at all.

Catbacks generally yeild little to no gains, but pair that 3" catback with a down pipe and you will see gains.

bikefreax · 07-27-2007, 12:48 PM

I put one on my 05 wagonf that a buddy of mine gave me,

and I mated it to a perrin Down pipe. It is a nice upgrade as it gave it a much better sound but not loud and ricey. Just what I wanted.

John Smith · 07-27-2007, 01:00 PM

is that to the wheels?!

Quote:

Originally Posted by silverey3

if ur formula is right then full 3" pipe = 0.015 hp gain

....

LXguy · 07-27-2007, 04:51 PM

Thanks guys

Pain++ · 07-27-2007, 05:20 PM

Quote:

Originally Posted by John Smith

is that to the wheels?!

Absolutely.

07-26-2007, 05:48 PM	#1
LXguy Scooby Newbie Member#: 154994 Join Date: Jul 2007 Location: Champaign IL	Can I put an STi cat-back on my 06 WRX? Hey All: Looking for a quiet upgrade to my WRX. Will an STi stock catback bolt up? Thanks Steve * Registered users of the site do not see these ads.

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07-26-2007, 06:02 PM	#2
kilfarsnar Scooby Specialist Member#: 106116 Join Date: Jan 2006 Chapter/Region: NESIC Location: Massachusetts Vehicle: 2018 VW Golf R Pearl Black	AFAIK it will bolt up. But it is not really an upgrade. The pipe diameter is the same. So without a downpipe you will not see any performance increase. even if you were to get a DP and EM it is still no different than the stock exhaust. I looked into doing this with my wagon. But I abandoned the idea after researching.

07-26-2007, 06:06 PM	#3
The Deliverator Scooby Specialist Member#: 42376 Join Date: Aug 2003 Chapter/Region: RMIC Vehicle: 2006 92x Aero	Yes. Easiest question ever

07-26-2007, 06:47 PM	#5
Matt_H Scooby Guru Member#: 107000 Join Date: Feb 2006 Chapter/Region: MAIC Location: Bristow, VA Vehicle: 2015 BMW X1	It's only .25" bigger then stock from the axle back. You will see maybe .005 hp gain.

07-26-2007, 08:02 PM	#6
silverey3 Scooby Newbie Member#: 151594 Join Date: Jun 2007 Chapter/Region: SCIC Location: SoCal/Rosemead Vehicle: 2004 sti white	if ur formula is right then full 3" pipe = 0.015 hp gain ....

07-26-2007, 08:13 PM	#7
Matt_H Scooby Guru Member#: 107000 Join Date: Feb 2006 Chapter/Region: MAIC Location: Bristow, VA Vehicle: 2015 BMW X1	Sounds about right.

07-26-2007, 11:27 PM	#9
silver-duck Scooby Specialist Member#: 130710 Join Date: Oct 2006 Chapter/Region: NWIC Location: Wenatchee Wa. Vehicle: 06	It will work great; with cobb dn. pipe sound and power are great; 287hp / 320torque[ see proven power]I have 06 wagon

07-27-2007, 12:12 PM	#11
Matt_H Scooby Guru Member#: 107000 Join Date: Feb 2006 Chapter/Region: MAIC Location: Bristow, VA Vehicle: 2015 BMW X1	Not at all. Catbacks generally yeild little to no gains, but pair that 3" catback with a down pipe and you will see gains.

07-27-2007, 12:48 PM	#12
bikefreax Scooby Specialist Member#: 110726 Join Date: Mar 2006 Chapter/Region: MWSOC Location: Columbia, MO Vehicle: 2005 WRX Wagon San Remo Red	I put one on my 05 wagonf that a buddy of mine gave me, and I mated it to a perrin Down pipe. It is a nice upgrade as it gave it a much better sound but not loud and ricey. Just what I wanted.

07-27-2007, 04:51 PM	#14
LXguy Scooby Newbie Member#: 154994 Join Date: Jul 2007 Location: Champaign IL	Thanks guys