Quote:
Originally Posted by Fantastic Z
I too had them next to each other and when you measure the internal diameter on the inlet side using a measuring caliper. The G coupe pipe is 1.8" inlet and 2.4" outlet. Both Y-pipes measure 2.4" outlet but, for some reason the G coupe piping is smaller. 08 G coupe Y-pipe vs 09 Z Y-pipe
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You could very well be correct there. I was only concerned with flange locations and didn't measure pipe O.D. Maybe the O.D. difference is where the extra 2hp comes from.