David, I've used that system on quite a few cars, and a number of 400 motors as well as 455's.. I think it's a great system for a street car and a guy who doesn't care about turning good numbers. But if your after every tenth you can possibly get then it's not what the claim. We even made the system
so they could easily be take apart with flanges for our testing. I did state in my first response that I use it on my 70 GTO, as far as I'm concern they stroke me. Oh sure there impressive on a street car that's had nothing but a stock exhaust system, that is very restrictive to begin with, seat of the paints feel is going to impress the hell out of you. My opinion on anything that's going to make hp, and especially with the bottle is FOR GET IT! don't waste your money, unless you want to have drop your exhaust every time you go to the strip.
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