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Only experience I have with after market hi flo cats was with Dynomax. I had a 5.2 dakota with a super 44 muffler. Sounded good but i wanted it opened up more. Summit racing had a dynomax hi flow uni. cat. it was 50 bucks. Completely opened the exhaust up like I wanted. Curious if I could make that cat fit on a 5th gen camaro then that'd be the ticket.
I dont think there would be HUGE gains with hi flow cats maybe 2hp to 3tq or something. But thats just a guess.
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