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post #29 of (permalink) Old 09-19-2013, 04:09 PM
color0
Grand Am Series
 
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Join Date: Jan 2013
Location: Pasadena, CA
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Not sure if things changed between generations but the 2.0L should get a 2.0" exhaust, yes. Upsizing post-cat to 2.25" does reduce the "pipe friction" for the exhaust gas so no matter what, flow is improved.

I don't think it's worth trying to upsize on a stock-block/head MZR 2.0. Keep in mind the MZR engines only go to ~7k RPM so we're not even in the regime yet where the built K20A boys start to complain about needing 2.25" or 2.5" piping to avoid choking the engine. 10k RPM's + aggressive cams + ITB's is a much higher flowing setup than ours, so if the biggest built K20's are using 2.5" I doubt that you can make use of it here, yet.


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