X-pipe question!
With that said, I switched my custom 3" Y into 3.5 I, into a cutout, with the duals, at the track. I picked up 1.5 tenths. I dont know what that equals to in HP, but there you go. Every car is different, but I would say you could expect anywhere from 7 to 15 hp. Every car is going to respond differently, & you may be running rich or lean to begin with. But I would think that if you switched, & used ATAP & a MAFT to dial the car in, your gains would be significant. JMO
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