Welcome to the board from Nor Cal.
I have the same bike, but don't have the heat issues......didn't even have heat issues when we went to Ariz. a few weeks ago.
There are a number of exhaust systems on the verge of coming to market for the 2010. The header pipe is different from the 09s (02 sensor buges are relocated). The air cleaner on the Screamin Eagle Street Glide is fine, you don't need to change that.....it's already opened up for hi flow.
I'm really puzzled why so many have major heat issues and I do not. Not complaining, just curious.
Everybody keeps telling me that I'll see that change once I put the leg fairings on however, none of the other SESGs came with leg fairings and some of them have the heat issues. I just don't get it.
We get together in Nor Cal often and ride together. There are a lot of us here.