ive got an 01 6-speed 2500, i tow an 80hp 4x4 tractor and big bushog through some pretty hilly country and was trying to see what the best towing upgrades would be to make more power and keep my truck cool. Ive got it straitpiped and a 75 hp programmer. this programmer sends the heat gauge up in a hard pull. I had played with the idea of a 4 inch dp and exhaust. Id also pthought bout 50-100 hp injectors and possible biggerr turbo. but i know more fuel equals more heat. any ideas or suggestions?