I just discovered this forum today and I'm hoping to get some help in making a decision on upgrades. I have an '03 2500HD Duramax, crew cab, long bed, 4X4, with 285's on it, and I'm looking at an Edge Attitude for performance upgrades. It has a air raid intake and 4" exhaust already, so I'm hoping that's good enough in that respect. I'll be towing a 16000 lb. land train (5th wheel and boat) and I'd like to increase my MPG and performance. I've been told exhaust gas temps. are real important, but I have no idea what's considered too high and what's normal. Also, are there any other modules other than Edge that anyone has experience with, or recommends? Any information I can get would be appreciated.