the story i was told (by a respectable rally driver/parts supplier) was a guy came in who had already spent shedloads of money on his rst,it was mint and running 210bhp.after a few months the same matey came back in saying ive got to have 240bhp.The supplier said it will cost a fair whack and might not be worth it.the guy said moneys no object and had it done.came back a few days later and said he hated it,it drove like shit,spinning up etc and did not seem as fast as before.