3" o/r X into 2.5" FR500?

D-Con

...Rather have a Buick?
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I found one of the quiet FR500 systems (thanks Will) with the intention of using an o/r X-pipe. :idea: Is any benefit of using a 3" vs a 2.5" X-pipe with this catback, and how hard would it be to adapt the 3" to the 2.5" cat-back? :shrug: Why would i do such a thing?

http://www.superchevy.com/technical/engines_drivetrain/exhaust/0505phr_exh/index.html

I read too much. This tells me that to make 600 fwhp a person should really have 3" exhaust. So I figure better to have the better-flowing 3" mid-pipe despite my less than ideal 2.5" cat-back. I'm planning on hitting 550 rwhp with my whipple. Through the manifolds, which doesn't help.
 
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03zycobra

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Many are running 600+ on the 2.5 inch exhaust. 3 inch mid pipe to a 2.5 inch cat back defeats the purpose.
 

D-Con

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no, not ideal, but blowing through a short straw should be better than a full-length one.

Has anyone approaching 600 rwhp compared a 2.5" to a 3" on the dyno?
 

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