4th no. 5th that's up to you. I kept the OEM 5th for highway cruising. The OS 5th is shorter than OEM. If the gears themselves are fine then reuse them.
Is it a Series 3 gearbox? If not you will need those parts. There is a list of those parts on SAU somewhere.
Has anyone found the power/torque limit of one of these? I know the competition model has a rating of 780 ps but that could be conservative. I've have never heard of someone saying 'upgrading to a triple because this can't hold my power'
Just a heavy pressure plate. The friction plates are the same. Normal version is rated at 640 ps and the competition is rated at 780 ps IIRC. For the sake of a little more just get the big one.
Forget all the junk you have heard. The two above me and myself are using them. No issues, no complaints and definitely won't be changing to anything 'better'.
Just buy one and be another happy camper.
I would still like to have a sample taken and sent away although after it went bang I wasn't really in the mood! I don't think the amount of metal (or should I say bits of oil pump gear) would give a good and accurate analysis. A susmmary saying "Too much oil pump shavings in oil. May need to check engine" wont tell us much
Maybe chemically the Ester base oil's with alcohol fuels dont mix but changed enough it doesn't become an issue. The longest mine ever went without an oil change was 2000 kms. Track days and dyno tuning it always got new oil.
Oil pump smashed. Ex cam welded itself to a few cam caps, belt jumped a few teeth and every ex valve got a little frisky with pistons (bent every valve and scored the chambers) . Intake cam is ratto.