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Message: [QUOTE="powerlifter405, post: 1231946, member: 2044"] If you can't afford a 6.4 tuned, easily 600 hp, then reassess if you're concerned w/ a high HP truck. A 7.3 has plenty of potential and Charles and a few others are running larger injectors and tow plenty. The 7.3 flexibility is the on the fly tuning but to actually tow w/ 4-500 real HP and tq you destroy things in a hurry. I think it was Charles who destroyed 2-3 of the rear ring and pinions while towing. He burned them up in the higher hp settings. The 6.0 runs quieter but in my experience the 7.3 got the best mileage of my usage. I really like the over all drive quality w/ the coil spring on the 05+ trucks. The 5spd makes towing smoother but I've talked w/ a few guys who have towed extensively w/ both and liked the 7.3 motor for its torque application due to more displacement. However, I like to maintain speed and both have tackled my 8-10k or so tows w/o any issues at highway speed. I wouldn't mind having an early 03 for the interior appointments then build my motor to my liking w/ some 238 or even 250/200, go twins or a GTX4088R or slightly larger w/ a BTS and it'd be a towing monster if properly tuned that is easy as pie to work on comparably to all the others. No emissions to deal w/, less sensors still probably the best mileage of the ford/IH offerings and it's cheap to insure. A tuned 6.4 is a beast and I hear the 6.7 is pretty solid but they are $$$$ and are not cheap to work on. Price out a HPFP for the 6.4 and you'll see what I mean. At the end of the day if you don't want a ton of HP but want something super reliable and is easy to work on here is this idea: Get a 7.3 w/ good compression. Alliant NIB stock single shots GTP38R and upgraded uppipes Torque converter upgrade Trans cooler upgrade Swamps or a a tuner who pioneered and focuses on the 7.3 That should get you a solid reliable truck w/ enough HP to get and keep most things moving. Mileage will be better than a 6.0 but the ride quality won't be as good as a 05+. If you go 6.0 then go 05+ for the ride. Flush the coolant. Delete egr & cat delete stud get a 63.5mm turbo tunes blue spring replace injectors if over 150k w/ FORD IMHO if you add any fuel, even w/ a tuner, I believe more air should be added. Under heavy throttle the EGTS can get out of hand if you're not careful. Good luck and don't be drawn in by lots of bling or trucks that have been extensively modified. I've read too many horror stories, trucks modded out then sold when problems arise, bandaided up for a quick sale. [/QUOTE]