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aladams01
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Charlie, just curious, why didn't the instructions in the owner's manual work? I had the same issue with my 2008. The owner's manual is written as if there are two sperate scenarios; Vettes73 instructions 1-6, and 7-8. In fact you need to do both back to back. aladams01
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I've read quite a few posts on other boards (Cayman Club, etc.) describing the moderate gains achieved with an aftermarket exhaust system. I'm not looking to debate the power/torque gains, it seems a dyno test is the only way to tell, what I am interested in learning is whether the secondary cats are actually needed? It seems every aftermarket exhaust manufacturer removes them and claims they can pass emmisions without them. Why then would Porsche use them? Does anyone have any knowledge regarding this? I apologize for the question if this is a repost. aladams01