Check my post a lot of problems
Problem with power when hot 2010 FLHTK

 

I just rolled I90 for 10 hours. At one point it was 106 degrees. My stock 2010 Ultra ran like a champ, but it did get hot enough to turn the right side muffler nice and blue at the clamp area. I think it's just holding back so much heat with the restrictions on the new bike that it can't breath. Tomorrow I'll visit my dealer. It does haul tail though, 90 on 90 was no problem.