I've got a buddy with a 2001 2500 QC SB Auto with 4" exhaust and an EZ on it. He would like to get close to 400 - 450 hp. He already plans on having sun coast do the transmission. I figured on putting in a Edge comp box, but don't know which injectors would be a good go or turbo choices. He does tow, right around 12-14K lbs, not not a ton of the time. Thanks!