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i'm not a pro by any means, but it works like this...you can do a DPF delete only or you can do DPF/CAT delete...there is not a big difference in price but it is easier, labor wise, to delete both and it is also better for your engine...you need a tuner regardless...it's weird how it works, but basically the higher HP tunes get you the best MPG's...i will add that there is not much turbo lag if any at all after the tuner is installed, i'm sure you have noticed the horrendous lag in these 6.4's...pretty much any shop can do the tune install, but you will be better off to order the package online like i did (rudy's) from ebay, most shops wont' carry these in stock, they are also going to be banned soon so hurry up!
do an EGR delete as well, they will eventually fail anyways, take my word for it...
i've heard most guys are getting 18-22 after the tune with a light foot...i'm getting 11.6 before the tuner, my truck isn't done yet so i have not calculated what i am getting after...i would be happy with 16-18 as a realistic hand calculated number
you can always do the lower HP tunes with all of the emission deletes, that's gotta save you some MPG's alone right there...but remember, just because you have the power doesn't mean you have to use it, although that's hard to do...
Last edited by Str8Strokin'; 01-09-2013 at 05:50 PM.