blaster racing series?



Which series do blasters race in? I dont usually hear about them much. Do people even race them?
I have heard them racing on some series but i have no idea what it is.
my cousin was racing in it but he end up totaling the quad before the race so hes working on a project blaster.
I've seen them in quite a few races in magazines and stuff. You just gotta look hard cuz there usually heavily modified. haha