Alot of these tuner shops like DP tuner can tune to most anything you like. My 04 was tuned for no EGR, heavy tow, and better fuel milage. Your best thing is call and talk to them on what your looking for. What truck do you have?
If you're going to buy a 6.4 get either an SCT with custom tunes from Innovative, or an H&S MiniMax with tunes from KEM Performance. Save yourself alot of headaches and money and skip the Banks garbage!
My personal experience is that it created so many headaches for my 6.0 that it went down the road to someone else and I bought an SCT and love it. The on the fly programs were very nice however it was a glitchy tuner that would occasionally change some input from a sensor to the point where I had turbo flutter at cruising speeds. It cost me almost a grand for the pda and six gun I sold it for $350 and bought an SCT and can say the SCT programs are smoother all the way around. And no the Banks tuners will not allow for DPF delete, EGR delete or any other delete for that matter plus they do nothing for the trans.