The C6 is an excellent motor. Very reliable and fast. Scott Kimbrow TQed the Great Lakes Challenge with a C6. Strong bottom end power - with the ability to RPM easily.

C6 breakdowns:
RB Concept C6-BB 3.48cc, 01006-BB, Buggy
RB Concept C6-CC 3.48cc, 01006-CC, Circuit (On-Road)
RB Concept C6 Rody circuit .21, 01006-RC, Circuit (On-Road)

The RC or Rody is the "Bad-Boy" for On road.
The CC is a solid Club motor.