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James,
Go to the Porsche website. There should be a detailed explanation of Sport Exhaust and Sport Suspension. I don't have these on my car but one of my friends with a 987 does. The Sport Exhaust button opens two valves to allow some of the gases to bypass the muffler. You probably won't notice much difference until you really wind her up.
My friend doesn't get too excited about the Sport Exhaust but he loves the Sport Suspension for track days.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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