A couple of my mates have had them over the years. I think the quickest one was running a 20L 16V Vauxhall for sprints and hillclimbs and Łuck me did this thing go

Been out in the Mega Blade one as well but it just didnt seem to have the same poke about it. Seemed to lack torque so if you got held up behind something doing around 70 / 80mph it took an age to get the speed back. Oh and about 4 downshifts

Mental machines though and scruffythefirst i can only imagine that with the cossie engine it must be insane