I rode my 09SEUC thu Nevada last August with passenger and luggage. (not the smartest thing to do, but that is the only time I could get off work). I wanted to take a cooler route home, but because of time we went basically south from Calgary area on the way home.Passing thru St. George Utah it was close to 115 Degrees and for several miles and they were putting down new Blacktop. Believe me this was a total scorcher. My bike is stock other the Fulsac stage 1 kit, no cat, open air cleaner and 1.75 baffles, and stage 1 download. Had to stop at Walmart to get new tennis shoes for my wife because the glue in the right tennis shoe let loose. The bike ran great with no issues. Got into Vegas just before dark and it was still 107 degrees out. I have the stock SEUC oil cooler, running redline 20-60. IMHO" leave well enough alone."CAHDBIKER