Saw an article about a 500hp twin turbo V6 New Beetle in MotorTrend. Total cost (car included) was $65,000 and consisted entirely of VW and Audi off the shelf parts. No aftermarket, no specially created parts. 0-60 4.25 sec 1/4 mile 12.99/102.41mph.
And these mods can be done on any current-model Beetle, Jetta, Golf/GTI or Audi TT.