Need some help!
12-08-2006, 10:37 AM
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Need some help! its an 02 z28 w/a 408ci ran execellent with 1st tune. It already has a tune for cam full exhaust and 93 octane, I recently put true dual 4inch x 4feet exhaust with flowmaster 1 chamber mufflers on it. I Now run 112octane and changed the rearend now it has 4.11. The car runs good until 3rd gear topend about 4800 rpm its starts popping. need some suggestions.
