for the lifts i would look into bds, cst, Fabtech, FTS, they are all top quality lift kits with the full drop diff i would stay away from rouch country like blackedout said unless your looking for a cheap lift then its right up your ally i guess. For the taillights not real sure what you are looking for you can always get some vht shade and tint them your self but i always been a fan on the go recon blacked out ones my self. i would recommend the magnaflow exhaust i have a true dual on my 2001 2500 hd and just loves it. like blacked out said cold air there aint much there bud i would recommend the airaidjr kit that gives u a drop in filter and remove the stock tube that would be your best bang for your buck there im personally running the banks ram air but i got a hell of a deal on it since my buddy owns a shop. im running spencershids and i just love them i recommend them to anyone who is looking i paid about 420 canadian for high lows and fogs but imo its all worth it for the costumer services and quality i just blew my ballast a couple weeks ago and all i had to do was take a picture of the ballast and he sent me in a new one.you can go with a handheld im running the hypertech for now and it works ok but im going to be soon upgrading to a blackbear and i would recommend if your going to get a custom tune done get all your parts on before your order it cause he will have the tune work with everything you got added to your truck.