First of all,
jmack, there is no such thing as a stupid question. Secondly, I believe
Hahn RaceCraft makes after-market turbo upgrades for the 150hp PT Cruiser engine. However, I've heard that when you get done paying for all the parts/labor one might be better off trading in his present car for a new PT turbo model. Check it out here:
http://www.hahnracecraft.com/
Good luck.
