I just picked up an 03 cobra. I know it has BBK long tubes and some exhaust shop setup after that. It also has a tri-ax shifter and aftermarket replica chrome wheels. The supercharger has an almost purple colored pulley and there is an added idler right below the supercharger. Does anyone know what pulley it is so I can figure out the size? The belt is an 8 rib 78.5" belt if that helps. The car misses pretty bad under load over 2500 rpms and smooths out at 3250 when accelerating and I think the previous owner pulled a tune before trading, so before I can tune I need to figure out to figure out this pulley. Thanks for any help.