I just installed a 366 kit from COTN. The only other thing to buy if you don't have are the swivel ratchets to get old turbo off. Easy install with no problems. Sounds great and runs like a new truck. I can't get my egt's over 1300 on the max effort tune. I too couldn't decide between singe or twins. For the $. I couldn't beat it. More than enough power for a stock bottom if you like to ya it safe.
04 LB7 CCSB Lt, silver, H2's, afe stage 2, SD tie rod sleeves, braces, banks big head and 4" exhaust, EFI live V2. Big Dipper SC IV, Airdog ll