I think I will go with HFC instead seems to be a lot less cel issues that way. If I could find a garunteed way to not deal with that I really like the test pipe idea. I spent an hr talking to my mechanic last night he was all against it(he drives a modded350 and works for Porsche). I value his opinion and after our talk I came home scoured the threads and realized he was dead on with the problems that test pipes have. Grrrr. Oh well HFC's arent that much more.
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