Vortech's early design of the system for the Duratech was less than stellar, involving many prop-shaft failures, as well as a lot of internal seal problems on the supercharger units they were using (apparently mostly because of the oil supply location choice though)
word is that most of the problems are resolved, but the man to talk to about Vortechs on Contours would be Worldtour, as he has probably the most hands on experience w/ Vortech problems, and was very active in helping Vortech resolve the issues.
My personal opinion would lean toward the turbo kit despite its higher cost. IMHO, the turbo kit is a more complete and better engineered. Despite the fact that I'm less than impressed w/ the tuning method used for either one (the turbo kit was trying to use a much better method of tuning, but development of the "chip" they were gonna use ran into some snags) The turbo kit also includes an intercooler, something the s/c kit is notably lacking (and really really needs)
