You also gotta keep in mind that Bumnah's car has been fairly modified for a while now. I'm sure he's familiar enough with his own setup to have a pretty good understanding of his car's dynamics. Its not like he's just a kid haphazardly throwing parts at his car. I think lots of practice, plenty of local events and an Evolution school or whatever road-racing equivalent would be a great idea... As jaje said: to improve the driver.