OMG! Your friend's INSANE! Man... a Sirio 3.0 Stampede... *shudders* The stampede with the .15 Pro is insane! The stampede with a 2.5 would be frickin ballistic... but the Sirio... your friend must like lots buying lots of parts... that's gonna be hard to handle (I'd assume anyways.). Man.. I bet you could throw some T-maxx size tires on that pede and I bet it would act just the same... *sigh* Sorry I keep repeating myself, but that's just crazy... Wish your friend the best for me!