i have heard of them, but does any one have a picture of one? thanks

 

Hmmmm that gives me an idea for my old Polaris 780cc Triple motor. However it is really long (inline) I couldn't imagine trying to make it fit in a quad frame without extending it a lot. WOuld be quick though because it is like 95HP stock.

 

or like an aquatrax powered quad? that would be the ultimate duning machine