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Old 11-14-2001, 12:51 PM   #1
Scooby Specialist
Member#: 453
Join Date: Oct 1999
Location: 小さいӔ
2017 Kia Niro
2016 Porsche Cayman GTS

Default WRX exhaust + CG8 2.5RS

I saw a guy in chicago who had a 2002 WRX twin tipped exhaust installed on his 99 2.5RS and frankly i thought it looked really good but i was wondering if there is any real performance gain installing this exhaust and i assume the midpipe as well. Anyone have any thoughts on the matter?

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Old 11-14-2001, 02:58 PM   #2
Scooby Specialist
Member#: 2359
Join Date: Sep 2000
Chapter/Region: NESIC
2001 Impreza 2.0 WRS


It fits on with only one muffler hanger needing to be reversed... supposedly.. haven't done it myself tho.

The gains will be negligible.. a few extra horsepower... won't be very loud compared to an aftermarket one, again I'm not too sure, since I haven't seen it done, you might be better off getting a low restriction aftermarket one, but it'll be more $$$.

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Old 11-14-2001, 03:13 PM   #3
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Join Date: Dec 1999
Chapter/Region: VIC
Location: Vancouver, BC, Canada
2003 Lexus IS300
Graphite Gray Pearl


Muffler might not be as free flowing as aftermarket ones, but the piping size is definitely ideal. I've been told by WRX owners that the stock piping size is 2.25" which is great for the EJ25.
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Old 11-14-2001, 03:29 PM   #4
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Chapter/Region: South East
Location: Lawrenceville, GA

I've done it ed.

You have to put your RS flange on the exhaust, and have it expanded to fit the new size of pipe. It's alot lower sounding at idle and growls much better than the stock one did. WRX mufflers are 3 chambers, and RS's are 4.

The rearmost mounts fit right to our cars, but the pipe mount needs to be turned around 180 degrees, and moved so that the "face" of the mounting pin lines up with the centerline of the muffler.

I'm probably going to be working on a B pipe that expands so the WRX muffler is an "almost bolt on" item. that way you can reuse the flange on the WRX muffler.

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Old 11-14-2001, 04:21 PM   #5
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Location: Salt Lake City, UT
2000 Impreza 2.5RS
Blue Ridge Pearl


I did this... I don't know if I gained any HP, because I went from an oversized 2.5" catback w/ magnaflow to this... the 2.5" catback w/ magnaflow muffler was just TOO loud... couldn't hear the stereo on the highway... and I hated driving thru my apt complex late at night because I know I was waking people up... ANYway, the piping on the muffler isn't actually quite 2.25".. it's closer to 2", tho the WRX midpipe is about 2.25" I think. don't ask me why they made the muffler smaller than the midpipe... anyway, you'll have to get a flange to match the muffler, because it's about 45 degrees off the RS midpipe, of if you want the whole WRX setup, the WRX midpipe flange is about 2" offset, 90 degrees, and about .75" too large for the RS cat flange... but once it's on there, it fits pretty nice(tho the pipe on the muffler comes a bit lower than the stock, I think, so if you're really low, you might wanna be careful). It's got a nice sound, tho and was pretty cheap to do...
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