I have had now TKO 600 for 4 years. First year it was stock and it was impossible to do high speed shifting.(Over 6000 rpm) then i ordered face plate kit and i could make high rpm shifts but i broke 3gear.(Too much clutch)
Then i change to adjustable clucth with less base pressure and Ram single sintered iron disc.Now it has went two summers no problems.My car weights 3800lbs and engine gives with sray 780hp and 1100Nm torgue.
I like the 5gear with 4.30 rear and 29 tires rpms at 60mph are 2100-2300.
Here is video of my car when it had too much clucth.
Regards Mika
http://www.youtube.com/watch?v=k7-Sf2yGRyk