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start with blackbearperformance.com
its the best $350 you are ever going spend man! I shit you not!! After I got mine done, I was pissed that I waited so long to get it done
Its a custom PCM (powertrain control module) tune. Justin changes the timing, shift paterns, rpm range, torque managment and so on... optimizes your vehicles performance peramiters.
the best mod you'll do to your rig, plain and simple