I see, I do have an aftermarked PCM for mine but its not really required for some basic charger mods. How about porting on the charger? The Eaton M90 used on gms can be opened up quite a bit at the inlet, the outlet reshaped, as well as the inside ramp right before the rotors can be enlarged and polished. The EGR is usually eliminated and a simulator put in its place but I doubt that would be avaliable for the Isuzu.

Is knock retard an issue for those with blowers or heatsoak? Alky injection has been a hot item on the grand prixs lately since its so cheap and the gains are crazy. Course this usually requires some flexibility with the fuel system so I wasn't sure what was possible with the VX.

Has anyone tried a larger throttle body or porting/polishing their exhisting one?

Sorry if any of these seem like dumb questions. I've just spent more time than money on the GTP and have gotten great results without breaking the bank. I realize that the VX is a whole diff beast but was just wondering what sort of stuff people had tried.