completely stock, the early v6 motors only run 8:1 compression standard, but even later one will take alot of boost for a standard engine, i know of a few running 20psi and have done so for years.
mine only blew the head gasket when it was getting 40+ because the wastegate controller pipe blew off (i didnt fasten the pipes so when they got hot they got softer and blew off) I normaly cable tie them, but this time forgot.
i have cut and shut the inlet manifold to bring the throttlebody out the front and i run 660cc injectors with a microtech ecu