I remember in the early Crossfire years Renntech advertised their highest-end mod package for the NA 3.2L which took it to something like 406 or 410HP. I believe that in addition to internal engine modifications and the incorporation of a supercharger, the package included upgrades to the suspension and brakes as well. Total cost was right around $20K which was around the resale value of a NA Crossfire as soon as it was driven off a dealer's lot. I doubt very many of those packages were purchased, and the availability of the SRT-6 in the resale market made the upgrade even less practical from a financial standpoint.