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Old 07-15-2019, 01:42 AM   #1
Scooby Newbie
Member#: 504260
Join Date: Jul 2019
Location: New Zealand
2003 WRX Sedan

Default 2003 WRX: How should i complete my exhaust?

So recently I have been looking into completing my exhaust setup, to a full turbo-back exhaust. Currently, I am running a the HKS Hi-Power Cat-back (https://www.redlineperformance.co.nz...aust-system-1/).

One issue with my current setup is that the HKS Catback tapers down to the size of the stock WRX downpipe. Therefore if I am to purchase a 3" downpipe, a new mid-pipe will be required to fit, as I want a full 3" setup.

Car: 2003 Blobeye WRX Sedan

My first option is getting an Invidia Catless Downpipe (http://www.mlracing.co.nz/invidia-ca...-new-only.html) at $675 NZD. This would require me to also purchase a new midpipe to fit. I have also heard that this downpipe can be quite raspy, which i would prefer to avoid.

My second option is getting a "nameless TBE KIT" from a reputable retailer (https://www.redlineperformance.co.nz...wrx-1992-2006/) ONLY $495 NZD, but possibly Chinese quality im not sure.
The bonus with this option is that it comes with a mid pipe which can replace the tapered pipe. It comes with a catless uppipe, although my model already has an OEM catless up pipe, however, this one may flow better. And i can keep my HKS Axleback to retain the sound I currently have.
My concerns with this option are two resonators in the kit. One in the downpipe itself and another in the mid-pipe. I don't want to reduce the sound the exhaust currently produces and im wondering if these may dramatically alter the sound I have currently and/or if it will be much different to going catless and resonatorless. Quality of this product is also a concern i have.

Any advice is highly appreciated
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Last edited by JewishNuggets; 07-15-2019 at 01:44 AM. Reason: Title Change
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Old 07-15-2019, 07:14 AM   #2
Scooby Specialist
Member#: 251046
Join Date: Jul 2010
Chapter/Region: MAIC
Location: Mostly at my home
2004 WRX Wagon
Stage 5.1.2a.2


I advise you buy my TurboXS downpipe. I just wrapped the “a” section with DEI. You get both mid pipes... cat and cat less.

But to answer your question about sound, the down pipes generally only have (1) cat in them. The cat will reduce the amount of sound from the exhaust. But they don’t change the tone so much. Not in my experience. A resonator like the one found in the “a” pipe of the exhaust section, does change the tone. Those tend to take out rasp and or “brraaaap” when combined with a proper muffler.
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