That is an OLD video of when Dustin got his first setup done. I think he has had 2 or 3 different turbo's since then, and is now doing a pro charger setup with a big single. His truck is going to be nasty!
Wide Open Performance is in the early testing phase of a bolt up single turbo kit for the 6.4, and there is a lot of interest in it....so it is more than likely a 100% go on their end. I plan on doing a setup on my truck with a decent sized single. I kind of want to do an S468 or S471 on my truck, but might end up doing an S366 so I can twin off of it later on down the road with like an S480. Doing a single leaves a lot of options open for future ideas/setups. It also lowers back pressure big time and makes these motors run a lot more efficiently. Spool up may not be quite as quick with a single, but the reliability side of it will really make it an appealing setup for a lot of people.....especially being able to see good numbers out of it (and GREAT sound!).