me and a mate are just doing one at the moment, got omex management for the engine, but the gearbox is the headache, were fitting the st170 box with a quaife diff as it dosnt require the inner wing to be modded, and was the guy were building it for's choice, but it has required a custom clutch, flywheel,mounts and the linkage fouls on the servo etc so the brake system has to be altered and also reqs a hydrolic clutch. at the min were just trying to get hold of pedle box, it has been a headache so far but focus rs engines are very strong and can be tuned to 350-380 bhp reliably with out been uprated, dont think a rs turbo box would hack it, were hopeing this will be a reliable conversion and well worth doing