I am a new member with probably an old question. I just bought an 06 F350 SRW with 8500 miles. I had a 2000 7.3 with an EDGE Evolution and a 4" exhaust. I tow a 12,000# 5th wheel. Everybody I talk to says I'll be disappointed with power and mileage. I know there are hundreds of things to do, but I was looking for actual experiences to get an idea of what to do and in what order, can't do it all at once. I am looking for fuel mileage, when towing and not when towing, most importantly. If a programmer is suggested, I would like something capable of changing speedometer. I eventually want to go up one tire size. The added power will be a bonus. Thanks in advance for any advise.
Pete, Welcome to TDS. It would be a help if you would add the truck to your signature line so we know exactly what you have or have not done to it.
I am not a big fan of performance modding a 6.0. It was tweaked at the factory to just about breaking point, and even stock can have headgasket problems due to a weak bolt clamping system. The 7.3 needed a tune to get it to what the 6.0 is out of the barn, but some guys are just NEVER satisfied with stock & gotta tinker.
What I'd do is 4" cat back exhaust & gauges (EGT, Trans Temp & Fuel Pressure). It's illegal to remove the cat in all 50 states.
If you feel like you just gotta have more power, an SCT tuner with a mild tow or street tune would probably be you "safest" bet. Just be prepared for the possiblity of needing to replace the TTY factory head bolts with ARP studs, and maybe honing your head gaskets. You may want to start saving for a beefier trans too.
You really don't need an aftermarket intake either. The OEM Donaldson is just about the best thing they did on the truck, with the best balance of performance, price, and protection available.
The trans cooler on the 6.0 is a good one too. You shouldn't need to add additional cooling there either.
It's your truck & your money, but my stock truck does everything I want, gets 18 unloaded and about 14 towing if I keep it at 60 (11 if I go 70), so I'd rather spend the money on fishing & camping gear.