Lol, Setup is a big factor. Its not always motor. in fact unless there are like MASSIVE long jumps your engine won't matter as much indoors.
I've seen the Mach .427 Haul some ass, don't sell it out.
LSP lots of Khz, Werks .28 8 port.
Revo 2.5, TRX 3.3 Engine, Center Diff. Fast and Turns on a dime.