First of all, please let me state that my search feature hasn't worked since getting my Samsung tablet so I can't look up anything. With that said, I put a set of Hush mufflers on from Hotvic and a new timing gear with a new chip for the fuel as well as an air filter. Now the question:: it seems that the heat at the back of the engine is incredible. Now it could be that it's because it's 90 plus degrees, but still the rubber inserts on my passenger pugs are coming unglued. Is there a way to cool down this engine? I know I could takeoff the cat converter, but I don't want to loose the torque.
Yep. At the very least get a Dobeck style tuner and if you plan on cams at a later date; get a PC-V. I like the Auto Tune module you can get as well so it tunes as you go. You can get both for around $600.
These are air cooled engines so they will be hot on hot days. I imagine the humidity plays into it too. Tuned correctly it can be reduced down to a tolerable level.
Are you feeling it on your inner and back of your thighs or is the seat getting hot to your butt? If the seat is getting hot you can put some heat insulation under the seat. Auto parts stores sells the stuff with adhesive on one side so you can stick it to the underside of your seat.