So just started looking for a tuned pcm and ive personally come across 3 different types that sorta tripped my trigger.. zzp 1.0 PCM, an Overkill PCM or an Intense.. Ive read on different Grand Prix and 3800 forums and all of them say that x brand is better but y brand has this over z brand.. i just cant really make out the TRUE differences in what each pcm is and all that.. Ive got an 06 gp gt.. also heard that with some tunes that the fuel gauge will be backwards..