i have a set of theese all i did wat get a small peice of steel the thcikness that i wanted and marked the holes the rite distance apart and drilled them then just got some extended bolts and jobs done :)
 
on the local chav scene were i live i was taking to a couple of lads and they bought this up and he said apprantly its adds an extra 5bhp at this point i broke down crying with laughter