tuning help
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
tuning help
alright i got a 91 gta. im goin to get a tune up and get new headers and finally get some true dual exhaust flowmaster 40's. how much will this help hp wise and my times roughly. any other help is appreciated.
