my clutch is slipping in 4th and 5th when on boost and progressively getting worse, im planning to eventually fit a 6 speed box, so my theory is whats best bet for clutch. go for a std one at about 170 that will hopefully last a year or so, or pay double for an exedy pink stage one.... its a classic sti version 6 running 310 bhp.....also got a nasty juddering when pulling away or coming down the low gears ( traffic driving ) believe to been damages when the pivot bar slide out of bell housing enough to cause fork to smash in to something fly or pressure plate im guessing as the last person to have the engine or gearbox out of the car didnt put the bung back in place to hold pivot car in place.