Aftermarket DP with Stock catback Help - Subaru WRX Forum
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post #1 of 4 Old 03-23-2010, 12:14 AM Thread Starter
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Aftermarket DP with Stock catback Help

I want to know if anyone has an aftermarket dp with a stock catback. I have read that this is considered stage 2 but are the power gains as noticeable as a full turbo back. I am thinking about going catless dp for now as there is still a cat in the mid pipe and a resonator.

Has anyone done this? If so how much louder is the exhaust? Sounds clips maybe? Thanks for any help!
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post #2 of 4 Old 03-23-2010, 06:49 AM
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There shouldn't be a cat in the midpipe - there should be two cats in the downpipe and one in the up pipe if you have an 02-05 WRX (06+ WRXs and all STi's come from the factory with catless up pipes). True, you'd still be considered stage 2 with an aftermarket downpipe, stage 2 ecu reflash, and stock cat back, but you'd see slightly higher gains with an aftermarket cat back since many of those utilize 3" piping and the stock cat back pipe is only about 2.25" in diameter.

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post #3 of 4 Old 03-25-2010, 10:16 PM
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a few months ago before i put my hks catback on i first put on a 3inch catless DP and i really didnt hear much of a difference. maybe alittle throatier when you reved it and alittle at higher rpms, but not to much.
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post #4 of 4 Old 06-06-2010, 11:56 AM
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That last statement is true for 02-05 WRX. All STIs have catless uppipes, and 06+ WRXs have catless uppipes.

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