Which 3" cat, w/o AIR, will make the most power on a modded TPI motor? It will be sandwiched between SLP 1.75" headers and a SLP 2OTL cat back.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association

Anyone???

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association

I hear catco is pretty good

NONE!
Actually I heard that it is good to have a cat in tpi engines because they need back pressure is that right

Catco are a cheap replacement. Although not the worse quality, i don't think that they are the best. They are stainless which is cool. I hear that Random Technologies have the best cat.. a little pricey though.

Random technology cats are best, but you are going to pay for it. They cost around $200-250, but flow almost equal to a strait pipe.

I have a 3" dynomax and I felt no difference between that and a straight pipe.

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