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We use vacuum pumps in racing and they give a surprising performance gain. Piston ring seal is better (very hard for oil under vacuum to pass rings) and the crank can actually spin in the crankcase with less restriction under vacuum.
I wasn't planning on running just a catch can, but an all out vac pump and catch can setup.
Failing the effort involved, I could just replace it with a new stock one...
Sam
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Australian Carbon Fiber nut
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