I've heard that OBDII computers are actively readjusting to render most performance upgrades useless on the 3.2L motors, but my source of info will not be disclosed. BTW did you notice that Active Autowerke's no longer sells the OBDII software upgrade? Coincidence? Things that make you go hmmm.... By the way it is a software upgrade, "chips" are replaced in OBDI engines only. YMMV.