In college we built Formula SAE cars with 450cc Yamaha engines. Even with the required 20mm restrictor, would beat good drivers in 400+ hp Factory Five Cobras at autocrosses (and all other cars). Of course those cars weighed less than 350 lbs (all carbon fiber), but this cart is going to be scary, in a good way.
DRW Member #124
2006 Suburban 2500 with 8.1L and 4.10s in the very very very early planning stages of being Duramax swapped
2006 LLY 3500 Dually, Stock except 4in exhaust - SOLD 8/15 with 454830 miles and still running strong.