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i dont think one single mod was the best thing, it is the ones working with eachother that make a difference...i think a cai and catback would be a good start
Honestly. Heres how i rate in order the top three most effective mods i've done
1. The 4.30 gears and rear end.
2. Stage 2 heads and Stage 2.5 cams
3. Long tubes and exhaust.