550WHP from a Y pipe, Just sayin. Y pipes are plenty for a NA and benificial for supercharged Z's. True dual won't matter much unless you are turbo. The only reason to choose true dual/ H pipe/ X pipe is sound differences. Z1 mentioned pushing 348 whp (NA) with E85 on a Y pipe based 3" Tomei exhaust. Y pipes are convenient because they are a direct bolt on with no other mod to the exhaust. The AAM is nice for Nismo direct replacements of exhaust components.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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