i wouldnt recommend wut spaztikid recommended cz ull ruin ur clutch like that in less than a few seconds.
if you put it on 6th gear and try to drive off from 0mph, ull burn the clutch in a matter of 5 seconds completely. you can notice when clutch is wearing out. the ignition point for the clutch will change, ur revs will drop lower when shifting, ur clutch will slip. ur car revs but the car doesnt go while driving.
as for clutches, there are many different ones like listed. it just depends wut you need it for racing, ...
changing clutch isnt like changing ur oil. you have to unbolt the tranny off the engine, take the tranny down, replace the clutch, put everything back together. you need jack/stands, power tools recommended. long work.