I bought mine new in 2001 so I won't post that price as it's not relevant. All supercharged VXes were created using an aftermarket kit (mostly Alpine with an Eaton mp62 SC). Supercharged VXes have an additional 40-60 HP at the rear wheels depending on pulley size (earlier units shipped with a 4 lb pulley, later 5 lb pulley and more horses) and intake/exhaust configuration. The kit ran anywhere from $2500-3200 plus labor for install.

Since the VX has limiters that prevent going over a top speed of about 120 MPH, the SC provides additional HP in the form of torque and throttle response - it also provides forced air to improve performance during altitude drives (not that you'll be crossing the continental divide every day but since the engine isn't starved for air you end up zipping past all the non SC and TC motors around you).

-- John