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I had my 02 Z28 tuned. It cost about 480.00 4 yrs ago. The car gained 17 peak hp, but when you looked at the power graph there were places it had 30 more hp down low. The car also got better gas mileage when the tune was done and It passed emmisions testing with better numbers. I think the guy doing it spent 4-5 hrs on it.
 
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