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I recommend doing a cold air intake, mufflers/ 2.5 in catback, PCMforless.com programming, 1.6 roller rockers and springs, TB bypass, and 3.73 gears with a new Eaton 400# posi. The 3.42 gears are a good choice if gas mileage is in mind, its said going from 3.08 to 3.42 isnt worth the money for the performance you get in return. If your thinking headers, Dan at clearimageautomotive.com has headers (Budget and Tri Y) which are MADE for these cars.
pssss. Try impalassforum.com for a lot more info.
etc.
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