BB, I own a 00 yukon 4x4 5.3. Im lookin into getting a tune, my 5.3 is bone stock only a cai, stock tranny as well. I do plan to do a vette servo and a muffler soon. Any other things u can recomend for me?? This is my dd, so I cant afford it ti be down for a couple days. Just lookin for a quick simple mods and a tune, any recomendations you can give me. I do think my truck is sluggish as well that why Im lookin into this, and just to wake it up a little. Help me out BB. Thanks