Never installed. Fits all M90/92/93 with production date 6/08 to present.
$499 at Dinan.
SOLD
From Dinan's website:
Dinan's lightweight crankshaft pulley is constructed of Aircraft grade billet 6061 aluminum that is anodized black and engraved. It does not modify factory harmonics or dampening and safely underdrives the belt driven water pump, alternator, AC and power steering to reduce parasitic power loss on the M3 engine. It produces a peak gain of + 11 horsepower @ 8400 rpm and + 7 lb-ft torque @ 8400 rpm on a stock car.
The kit includes lightweight pulley and shorter belt for bolt on installation.
http://www.dinancars.com/shop/D560-0...2011-Only.aspx
thanks, Rick