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You'll get a million opinions as to what you should do as far as mods go, but it's really all in what you want to accomplish. Most folks on here seem to discount the CAI unless you have already done many other mods as the intake on a LMM is plenty until you get into really high HP. I know you'll get a bunch of suggestions for tuners, so I won't jump in there as I am not an expert by any means. I chose EFI, even though I am a begginner, because I typically try to do something one time, get the best I possibly can, and "grow into it"!! I am no where near writing anything for myself yet, but I didn't want to change tuners later. That's just how I am, take it or leave it.

As far as DPF (not DFP), it stand for Diesel Particulate Filter and it is universally despised around these parts. Cutting it out will help your mileage, and likely your sound, but yes you will need a tuner to tell the ECM whats going on.

EGR block is just a metal plate that prevents exhaust gasses from being recirculated into your engine (another treehugger feature). There are some pretty funky pictures on here of what you'll look like after a few thousand miles if you don't block it.

As far as leveling or anything suspension related (or any mods, for that matter), talk to NorCal Nick (owner of Norcal Trucks). He's the man on that stuff and will treat you right.
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