Hands down, best you can do is a TS flip chip with custom tunes. go on Powerstrokenation.com and search for 7.3l tuning. Hours of reading. Then just pick your poison. Ive had experience with just about all of them. And i have finally found my permanent tuner. Beans. Jonathan is excellent to deal with. If you are unhappy with something. Hes not happy until its fixed. Gearhead, Powerhungry, Swamps are also at the top of the list. I would stay within those 4. Best money you will spend.