[2jmotorsports]

Originally Posted by cabmando

I'm gonna be the nut that suggests a go kart with a Lifan 420 or Predator 420 engine. You can tune the hell out of these things and the mods are cheap. I think you can get fuel injection systems for these engines or play around with a carb. You can even find a turbo for these things!
I could be way off base here but if you want something that is highly modifiable, tunable and cheap, a single cylinder or even some of the twins would seem to be an obvious choice.

Hmm...karting...like F1 drivers...this is also a tempting option.