Alright so I have a few questions going into all this, I'd like to get my info befor I commit to it all so any more help and insight is appreciated. Like I've stated befor i had a 05 intake with hypertec tuner and 5inch straight pipe.....my newer truck is a 08 bone stock, exhaust is ready for replacing and the truck is basically at 100k miles, so I've been weighing all my options between exhaust size and tuners and so on... I've come to the conclusion I think I wanna go with efi live and kinda "support" the forum and so on, I'm from upstate ny... I don't have any background with efi live, so my question kinda is I'd like to kinda get a guy that's gonna plan on tuning the truck or maps for the truck or whatever need be, I'd like to see the tuners take on which exhaust size weather it matters or not, I don't wanna lift the heads or anything crazy just intake and exhaust with a reliable tune, also in my other thread mentioned a turbine brake to add to the tune? And another question is tow haul mode and If I put a tuner on the truck how with putting tunes on the truck affect the tow haul mode..? Do you just not use it or? And exhuast size I'm thinking between 4 and 5 muffled or most Likly resonated... Thoughts and additional opinions on all the above? Thanks