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I realize this is an aero question, but you might want to also look at some drive train mods such as cleaning up the air intake. Most OEM intakes strangle the engine and then there is the matter of the exhaust. You can usually get some benefit of a cat back reduction in back pressure by replacing the muffler and/or some of the rest of the exhaust without getting too loud. That and replace the lubricants with good quality synthetic lubes and don't forget to give it a good tuneup and clean out the injectors and intake valves with an additive such as 44K.
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