What timing, I spoke with Dinan today. I have a US 3.6 and while I'm having my engine rebuilt I figured it was a great time to install both cam gears. They sell the sprockets as a kit. You get the intake and exhaust gears. I already have the exhaust gear and they won't split up a set. I went here and found the part number for the 3.8 intake cam gear(http://www.realoem.com/bmw/select.do?vin=&kind=P&series=E34&body=Lim&model=M5+3.6&zone=USA&prod=19910100&arch=0.)Then I called BMA Parts and ordered it for $114 US. Dinan's web site claims an increase of 54hp and 52# of torque with their gears plus chip.unesential said:Dinan still makes the exhaust cam sprocket.