Quote:
Originally Posted by MTV2002
is the car under your avatar the one your speaking of? because that may be true in the N/A world but the FI crowd its a whole different ball game. i have a pre cat about 1.5 inches from the turbo outlet, then about a foot and a half i have the "main" cats. i went from 333 wheel tq to 395 wheel tq just from upgrading from stock downpipes to 3 in ones with no cats at all. the stock downpipes are 3 in from the mouth and then taper after the "pre" cat, this was on a dyno dynamics "heart breaker" dyno. i can tell you it made a huge difference in spool time. again im just speaking in terms of FI i have no idea bout the world of NA all this was done with meth turned off as well, and both runs were done one day apart. also i run the stock exhaust and i can tell you it sounds a lot different. just my 2 cents.
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I think the change in the piping(since the stock one was tapered0 did more for the HP the nthe actual cat removal. Turbo or not makes no real difference. I've done a ton a research on cats for different cars that I have owned, looked at, ect. My GTO isn't effected by cats or catless. Julie's HHR SS doesn't gain from going catless, but it does gain from better piping. WRX forum came to the same conslusions.
Not saying its a fact you won't gain anything, but 99.9% of the time you will make your car raspy and smell like **** for nothing.