http://www.dinan540.com/MODIFICATION...fications.html

The replacement intake manifolds feature larger diameter "runners" for improved engine efficiency at higher engine speeds (rpm), resulting in increased horsepower and torque. When installed in conjunction with fully matched Stage 5 Engine Software, the Cold Air Intake System, High Flow Throttle Body and Air Flow Meter, peak horsepower is increased to 321 @ 5700 rpm, for a 40 hp gain (with a peak gain of 48 hp @ 6500 rpm) over the stock rating; torque is up by 39 LB/ft @ 6000 rpm. The result is faster overall acceleration, with the car feeling noticeably more willing right up to the rev-limiter. Not available for cars produced prior to 9/98 because they already have larger intake manifolds, mass airflow meters and throttle bodys..

wouldnt you just snag an older Intake manifold then?

seems like unlikely performance gains. Especially the Dianan CAI on the shorter improved e39 540i intake... 11hp and 9trq? Wouldnt that be even higher on the m60?

Whats your thoughts on this?