Would appreciate any input or opinions on the following. (I already have a Lenale fan) After reading all the posts on HD Heat management and Lenale fans, I was going to have my HD dealer make sure my Heat Management (rear cyl. shut down) was activated (since he said they would do it for free). However I've been reading some other input about HM on the net and there is a consensus among some that the HD HM (the rear cyl. shut down) is primarily for rider comfort rather than engine protection. They claim that while the rear cyl. does in fact cool down (along with the rider's thighs) the front cylinder is still suffering high heat. So this sounding logical, I would think that just relying on on the (other) less documented dropped idle speed/mix cooling scenario, ECM activated by default (that Smitty's old post spoke of) would actually do more good to preserving both cylinders (not discounting the air that a fan would supply).