Quote:
Originally Posted by UNKNOWN_370
Leave the cats stock. Just use a non-res exhaust. It will be the same difference in sound and hp. Either No resonators on the exhaust on a stock cat or test pipe on a resonated exhaust will still give similar gains. Unless you are changing everything from the intake, headers pipes and exhaust. The switcharoo won't make a big difference. The only true difference is forced induction.
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That's a really interesting idea -- I didn't think the resonators on an exhaust as restrictive at the core of a cat. If true, that's a good way to stay OEM and green, but pick up lost power. Would be neat to see a dyno comparison of the two set ups.