The RC18T is a very versatile vehicle. And yes it can be upgraded to go very fast. Tony Phalen recently ran his in a speed attempt and hit 73.4 mph with an almost stock set up except for a 6800 mamba brushless motor, 4 cell lipo battery, 1/12th scale body, and 1/12th scale springs. Towards then end of the track the radio glitched, the car turned left and launched the car about 20 feet in the air before crashing back down to the track. That truck drove back to Tony and the only damage done was a stripped spur gear. A $2.99 part.
p.s. I race mine both on road and off road