I have studded my truck for extra insurance with arp625. I have heard nothing but good fron people that have used them. Im in process to a 650 to 700 horse daily driver towing truck.Efi live has worked great for me, this is how it works. You buy the tuner $600-$800 hook it up to your truck and read it at that point you will acquire a stock file. Download the stock file to your computer and send it to the place you bought your autocal( tuner ) from via e-mail. At that point based off what your trucks mods are and deleted items are they can start to write your tunes. The great thing about efi live is you can correspond via e-mail so it makes it easy and convenient. I saw good gains in MPG 22-24 highway and HP the truck runs cooler as well.
