Medici, I only know of one GTR R33 which is running a huge single HKS TO4R turbo kit. Doing about 525 bhp at 1.2 bar of boost. Cam setting is 264in 264 ex with oversized 87mm HKS forged pistons. Went to tha track with the owner last mth and it is damned fast. Whupped my GTR coming out of a corner in 2nd (I was in 3rd!). Managed to catch up later but too late to overtake. Lag seems to be less than my GT2540s but I heve more top end power after 6500 rpm with my 264 in and 272 ex set up. Haven't had the chance to drag race with him. The owner however had dragged with a GTR with GT2530 and he lost out in the quarter. I suppose it's a good set up and the TO4R kit is actually very very good value - came with manifolds, GT wastegate etc.