Thanks Tyler, I guess the main reason I went with a 4000 instead of a 3000 was I was more concerned with holding a steady 70 mph speed while towing up the mountain rather then getting everything moving, also lowering my EGT's was another big concern. With the stock, I had really overheated a few times pulling the mountains and the 4000, according to my research, was good for 200 degrees less than the 3000 keeping EGT's below 1400 degrees, which I have still never seen. When I was completely stock I had tractor trailers passing me on a 4% grade and that's when I decided to do some mild upgrades. With my current setup, she still comes off the line well and even the lag with the turbo spooling is barely noticed even with the camper attached. Like I had mention earlier since I took the 75's out and went back with stock, she is still very driveable and tows well but the difference between the injectors is like night and day. I am planning on have my other engine built and in the truck by December, so I'll let everyone know how it comes out.