They're expensive but not too much more than other high performance single disk setups. A quick look at clutch assys at summit:
Center force DF ~ $260 + steel flywheel ~$260 = ~$520. The McLeod twin disc (steel flywheel) is $860. "Only" $340 more for a much better clutch.
An alum flywheel (Centerforce or Hays) is $400 - $600 ($660 - $860 total). The McLeod twin disc (alum flywheel) is $975 and still not that much more.
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