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that's a whole debate right there, some say you need backpressure, while others say it ain't good at all.
For the cat, my old original was probably clogged, that why I felt gains. I just got my emissions test and I was a little dissapointed. I was expecting it to be super low since i got the new cat and put in a new bosch oxygen sensor, maybe high-flow cats don't do well at lowering emmisions, oh well. Better than the last one's.
I was sorta afraid to get the magnaflow because i tried flowmaster and that cheap thing was loud and ugly. The interior noise was horrible!
oh, but the magnaflow! I think i'll use them forever, i can't feel or hear much interior noise even though it's loud outside. very good for it's price range.
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Forever 4A-GE
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