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Make sure the head your using has the good valves in it...the last 2...
That is hard to believe when normally a factory tune is very conservative....
You won't see any gains if you don't upgrade engine components.. A stock...
I recently bought a low hour RXP and have been looking for tuning options....
Which RXP are you tuning? There has been a bunch of them some respond...
Any HP Tuner users out there?