Gggrrr it seems more likely that I'll have to end up keeping this thing. Who here tunes 04+ pcm? I asked repile and he doesn't do the newer grand prixstill need to be tuned. gt pcm will have na tranny settings and you got a sc HD tranny.
Wouldn't I need a tune for a top swapped l26? Would I top swap have check engine light? Even with 4.0 pulley?