Quote:
Originally Posted by techwhiz
If the cats are working correctly, it should just pass.
I have the numbers for my car and emissions on these things stock is almost unmeasurable.
Adding free flow cats should hurt anything. Remember we also have secondary cats.
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Very true . I have ultimate racing catted down pipes with 60k on them(FBO ) running cobb stage 2 + Fmic aggressive and passed with numbers well within range. I was running 2gal if E85 to raise my octane to 93( I'm in SoCal with crappy 91 acn).