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i think your best bet is a custom made one, you'll be able to give exact specifications you need and not settle for a close enough off the shelf cat back
Yes it was for him, but he was running the smaller rotrex without an intercooler so his exit temps were a lot higher and the N1 helped the gas flow quicker than the std one. With an intercooler the it all runs cooler so maybe it's less important to have a less restrictive exhaust. I think the std back box is pretty good. I don't know how much of a gain I'd get with a 75mm system but I know it would be LOUD!
Thats the way I see it anyway.
I doubt you'll get much of a quieter setup than the one I've got. At 5k revs we're moving a lot of gas through the exhaust,to make it quieter will start to reduce the power.