Quote:
Originally Posted by bobc455
Remember that cats are designed for the engine - if they are too big they won't get hot, and if they are too small they will be a restriction.
If you are only installing it for the sake of passing emissions testing, then you're gonna pull it back off, I would err on the side of "too small" instead of "high flow".
-Bob C.
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Nothing works as well as an OEM cat in my experiences and it has more cross section and length than any of the high flow units. Nothing even comes close to a known good stocker. There is no cheap aftermarket high flow cat that will flow the exhaust volumes an engine over 400 hp will be creating without causing a big restricion.
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Blue GN: Old combo 559whp/706wtq. New buildup to come with race ported GN 1 heads and intake  .
Black GN:Stock 147k shortblock except cam  ,KB 70 mm TB and plenum, ported irons 1.77in 1.5ex, RJC head gaskets, ported stock intake, 212-212 comp roller, 1.65 T&D's, RJC powerplate, 1" plenum spacer, 83 lb/hr injectors, double pumper, FAST XFI, G-Body FMIC, welded ported stock manifolds, 3.5 dp, CPT 66BB GTQ, PAC dual nozzle alky injection, Dusty PTC 9.5", 200 4-R by me with billet shafted forward drum, billet input, billet ring gear and planet. 8.5 rear with Auburn, 28 spline Moser axles, and LPW girdle. 10.29@133.46mph .Time with old combo (stock ecm, p-trim turbo, and loose converter) 10.88@126mph. Stage II coming soon .
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