I have the gp 1/4 pw 300l with a 3w 50. I haven't flown it yet but it should be great! If you want an easy clean instalation don't get the 3w50i for the gp extra. I had to cut and hack to get the carb/ muffler/ choke and throttle set up. The rear carb on the 3w is a pain in the butt to get set, and once you get the muffler on the neddles are not accecible. So what im saying is... the 3w50i and the gp patty are not the greatest match!

Go to the thread on the gp extra to learn more...its has somethin like 2000 posts in the arf forum.

Chad