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Stock Twins King
4,619 Posts
Discussion Starter · #1 ·
Have a question.

I have the HKS Downpipe, and the Blitz Nur-Spec exhaust. I still have the initial cat from my header down to the downpipe. Everyone seems to think I should not mess with this. Because if I do, I would then have not cat's at all. Probably would not pass Emissions. How restrictive is this Cat? Would I gain all that much if I knock out the honeycomb stuff that is in them?
As an alternate, would a Hi-Flow cat at the header do any good. HP wise, in place of this stock cat? I heard another 20+ HP?

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