RE: Need fast HPI MICRO motor!!!
If you want fast, dump the Spy and get a Castle Creations Mamba-25 speed control along with a CM2080 brushless motor. If you think you can handle a 3-cell lipo, try a 4-cell lipo. That's the set up one of the locals is running in his MRS4. Myself, I'm sticking to the 3-cell lipo in my Xray M18.