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exhaust flow comparison

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idt512

20+ Year Contributor
231
9
May 4, 2003
Hemet, California
Which exhaust would flow more?

2-1/2" without a catalytic
3" with a Hi-flow catalytic

Also which would be quieter between them?
 
It's such a broad description but I would suggest going with a cat so 3". But noise level will depend on the muffler mainly, and I've heard good things about burns, apexi and some magna flo but being a turbo engine changes the requirements.
 
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