I've heard good things about them and after blowing con road and totalling my previous engine I'm after something to have a play with and cheap. I've since bought an x-act .21 3 port motor which I plan to do a bit of work on. £65 for a high revving motor seems fairly promising. I will be saving up for a cmb. thanks for the reply. if anyone has any missing tips to try and squeeze a few more revs out of the motor would be gratefully received. currently running a Macs 1329 tuned pipe. is it worth taking a dremmel to the ports? cheers Olly