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I'm not sure, as I didn't measure the diameter. Bimmerworld didn't specify IIRC.
The best option is a medium weight (steel) single mass flywheel, if you can find one. I think the chatter of this setup would get to you. My new tune will include a raised idle to 950 rpm, and that should help with the chatter. It will hurt gas mileage... to what degree, I'll find out. If you spend a lot of time at idle, I have a hard time recommending the lightweight flywheel. You lose some of the BMW-ness of the car.
The Bimmerworld setup will give you the sharp, immediate engangement you're seeking though. I guess you'll have to weigh how important that is to you.
Clutchmasters makes an organic setup that works with the OEM flywheel. It has increased clamping force at the expense of more pedal effort.
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