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you'll get gains out of it, 15hp or so. in the long run combined with other mods it will make a difference. There is no "magic mod", the 3.4 is very tough to see gains from. headers, you probably already have a CAI, 18/19lb injectors and AFPR, and you'll see about 30-40hp at the flywheel at most. I forget if your car is manual or auto, but the 3.4 just doesn't have the grunt to spin the auto and its gonna be hard to notice a difference until you make a big gain.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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