i have an lrp .18s pro spec in my gt. its really just a basher, and it runs great. it broke in really nice, and with a little tuning it runs mint. most people seem to go for OS but personally i've been really happy with my lrp. Sts putting out 1.51 PS and is good to 31,000rpm. Tower hobbies has them for $120, just make sure you get the clutch nut for it it. The only bad thing is it likes to eat up tires pretty quick if you run it hard.