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Originally Posted by Wisha Haddan H3
Questionable mods (your results may vary):
Throttle body spacers, PCM re-program, electric engine fan, exhaust headers and cat-back (if tested and tuned for power instead of sound on the 3.5 or 3.7L application).
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Actually (as noted and claimed by many others) the H3 leaves a lot on the table as far as tuning. Good differences in throttle response and passing power along with 1-3 mpg are to be had with good aftermarket custom programming.