Don't spend the money for a supercharger (assuming they work, which is another debate all together) and then put it on a crappy TRX engine. for $179.00 you can get an OS 18TZ which has much more power than the TRX 3.3 is much easier to tune and will last longer. It will bolt right in for the most part.
http://www3.towerhobbies.com/cgi-bin...?&I=LXHLV9&P=7