Thanks for all the replies guys. Lots of good ideas here. When you first mentioned the air dam I thought you meant it goes inside the cowling? But I see in the last post you've mounted it outside. The aluminum tape is a great idea that I think I'll also do for strength and heat reflection. I really do like the idea opening up the cannister tunnel exit covering as that way I don't have to cut up the cowl hardly at all, and still allows me to run cans later on without any changes to the cowl.

I may go ahead and block off the 2 intake holes for a twin like you've mentioned as well, just depends on my final setup. BTW, in skip1320's post link above, that is the EXACT plane and cowl I'm building for reference. Thanks btw skip, I didn't realize the DLE 55 head stuck out the cowling that much as I haven't mounted mine yet. If it does protrude that much I should have little to no issues with cooling. Skip by your comment did you end up crashing yours? If so how come?

Keep any other ideas and or pics coming. Has anyone done any testing with different setups to measure actual temp drop? Or any real life numbers associated?