Join Date: Feb 2002
Location: The OC, CA
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I think I will go with the printed dyno over your butt dyno unless you can crap out a chart for me.
A test pipe over a stock cat will have some gains, but compare the test pipe to a good high flow cat like the Carsound and it's nothing. Just look at the flow numbers in the cat article, the Carsound is pretty close to it's equal-sized test pipe counterpart.
Turbo or S/C may be able to utilize the slightly higher flow capacity of the test pipe, but I didn't see either mentioned anywhere in this thread, I would think this thread would have been put into our F/I forum then. I'm assuming this is in regaurds to a bolt-ons N/A setup, in which case a test pipe will not outperform a high flow cat.