not sure of the reason, maybe there`s jigs or some special testing machine used. check the cost of a pro re build against a new turbo if you get it wrong. but maybe there is nothing special and its just labour that costs ???
hey Carl, i have sourced one in the last few days, thanks so much for offer, i know someone else who`s looking for one. i will let him know. thanks again.
50 bhp 100 bhp ect just the size of the jets that allow the nos into either air intake or directly into the port, nos gives a bigger bang in the cylinder and makes more power.