Probably the best (but not the cheapest or easiest) way to keep header heat out of the engine compartment is to have the headers ceramic coated. I know JetHot coats the inside and outside of the tubes, so you get a double wall of insulation.
Alternatively, you could use asbestos header wrap tape to insulate the headers and keep the heat out of the engine compartment, but I wouldn't recommend it. Several people have told me of their header wrap experiences that ended badly. Basically, the pipes get eaten from the inside out since the heat can get into the pipe but can't escape to the outside, which drives up the temperature of the pipe wall. Ceramic coating prevents this by having an insulating layer on the inside of the pipe.
Of course, either method requires pulling the headers off your bike, which would make it a winter project for me.
Did the header wrap thing when the bike was down. Cant say anything negative yet. Its a wait a see thing. Temp wise I've seen 230 degrees in 90 degree stop and go. Dunno if the header wrap plays a part or not. The main reason I did it was to insulate the heat baking the Penske shock. Also supposidly there is a bit of a power boost. (Hotter exhaust gases = higher gas viscosity = faster flow = more go)
Maybe I should start saving pennies for a Motad.
MD