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Project G-370 exhaust

Originally Posted by jwick Where did you get the G and Z y-pipe being different? I've physically laid both on top of each other and they are identical. I too

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Old 04-01-2014, 08:45 PM   #1 (permalink)
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Where did you get the G and Z y-pipe being different? I've physically laid both on top of each other and they are identical.
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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Old 04-01-2014, 08:58 PM   #2 (permalink)
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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
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.
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