Yup, exactly! I was a 125 guy and nothin was better....till I got to twist a YZF 250 off the line. I jumped off, wide-eyed, thinkin..."Holy crap. Really? That's the fastest effin couch on the planet!" Too easy...
I'm thinkin it might be the same in RC if someone is thorough enough. Gear up a little everywhere (spur, pinion, f/r diff input), toughen up the driveline/clutch a little, tune suspension to handle the weight, and roll on with a smile! If the engine is built well enough it can scream between 9 and 12K rpm.
As of now 8th e-buggy is already exposing some of the torque issues in the drivelines and how torque changes suspension tuning a little. BL torque is nothing compared to what 4-stroke can do after gearing up. Interesting stuff...