My 96 I have now is set up to push over 700. I will know exact hp at the end of may when it hits the dyno, But you can tow with a 700 hp truck problem is the speed you chose to run down the road at, and what hills you have to deal with. because egt's are your problem you have to deal with you could be forced to run with od off alot of the time, depending on you turbo's and yes turbo's because you will want twins in order to tow and have that much hp in the truck. Also time spent tuning the afc so that you are controlling your fuel for how you drive and pull. My last truck was close to 650 hp and I never had a problem when towing anything with it.