BMWPower

Member
Jul 7, 2005
75
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I was thinking about either buying a Boyesen power valve cover or buying a spacer for the stock one. Will I lose any mid or top end because of this mod, and if I do end up going with the spacer which should I get the 5mm, 10mm, or 15mm spacers, the Boyesen is only 5mm deeper.

Thanks
 
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