2.5" ?!???!?! - Subaru WRX Forum
 
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post #1 of 6 Old 11-21-2005, 09:40 AM Thread Starter
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2.5" ?!???!?!

ive noticed that the turbo xs exhaust system(non RFL) and the greddy evo2, have 2.5" tapers before the muffler. on cars that are stage 1, 2 or 3, does this pose any real issue? im sure that a true 3" from the turbo to the muffler is ideal, but does a 2.5" taper rob any significan hp?
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post #2 of 6 Old 11-21-2005, 11:19 PM
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supposedly no it doesnt.
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post #3 of 6 Old 11-22-2005, 06:03 AM
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they are ok till bout 350hp. they make the exhaust significantly quieter, especially on the freeway at cruise revs.
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post #4 of 6 Old 11-22-2005, 09:14 AM
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I have tried both on the same car. Even tried the APS 3.5" system. Didn't notice any difference except sound, but that could be a result of the muffler used as well.

The larger downpipe diameter is the important part.
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post #5 of 6 Old 11-22-2005, 10:18 AM Thread Starter
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any thoughts on the turboXS non RFL TBE, or the Greddy EVO2 Vs the Perrin dual tip? the perrin and greddy would be mated to a COBB catted down pipe, and the turboxs would use their 3" high flow cat.

i wanted the perin because of the style, but seeing as how im 25, almost 26, i really dont need the 350db exhaust note, just the performance... any thoughts on these???
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post #6 of 6 Old 11-27-2005, 10:59 AM
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Well just to let you guys know even the turboxs rfl muffler also only has 2.5" piping. It goes from 3" to 2.5" in the midpipe. Its the same reason im looking to sell mine for a full 3".
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