I have put some good money into my SC10 by buying all the FT options and a Speed Passion 17.5 esc/motor. Anyway my question is about the RPM arms I have been using them for awhile but they seem to soft/flexible and should I just go back to the stiffer standard arms? Also what gearing are you guys using with a 17.5 setup? One last question my SP 17.5 has vent holes in the motor can and should I cover the vent holes(piece of nitro air filter) since my track is dusty? Anybody else using the M2C tapered hole pistons? Thanks for any info/help!