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im going to go custom piping 2.5" for an exhaust, but ran into an excellent price for a muffler that is for 3". how do you think it would fare for a jrsc prelude running 9lb? any consequences between running a 2.5 and a 3" (for 9lb, not 6lb). thnkx
 

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A 3" exhaust w/ JRSC would be loud enough to wake the dead. I don't think a 3" would gain any more than a 2.5" at 9psi. When you get into double digit boost numbers, a 3" becomes more useful.
 
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