best headers and high flow cats or my vt supercharged?
I'd be doing pacemaker 1.75in competition header with ballistic cats but thats for VT
you have VR in your sig so 1 5/8in headers for that model
why is it an "or"? do it all!!
I think it's supposed to be "for"
Unless you're pushing very big numbers, I think you'll lose a little bottom end with 1 3/4" primaries. For a stock to medium build i'd be going 1 5/8" primaries merged into a 2 1/2" collector. Personally I like the magnaflow metal substrate cats.
Cheers
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I can do Wildcat extractors and Magna Flow cats for $590 shipped to your door. The extractors are 1 5/8" primary.