I used to own a bug before i got my supra. A stock wrx motor in that thing would make it hit 12s and still sound the same. Tack on a few other mods (chip, boost controler, bigger top mount, drag radials) and it would have seen 11s. Its a good thing that I noticed the floor rusting away, otherwise I would have never gotten the supra.
If you want to see some SICK bugs that will dominate a ton of cars go to
www.shoptalkforums.com and check in the conversion perversion forum.