Quote:
Originally Posted by Asbjorn
Secondary cat delete is not raspy with stock mufflers, and also adds a bit of horsepower.
I now run secondary cat delete and race catted downpipes with gc lites. It is significantly louder, and the step up in sound volume was larger than that of secondary cat delete compared to stock.
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Bit of horsepower? like 3HP? Downpipe is closer to turbos and they spool freely when going catless downpipe hence more gains ~20HP.