DO you want my honest opinion on this one?
Your gunna get it anyway... LOL
The single is cool, the sound is good, and so far the streetability seams to be liveable, i dont know how fun it could be but i would imagine its not a bad drive. The other benifits are you can upgrage and run a big set of twins later on down the road, so there is the upgrade factor to it, Also with WOP single and others is you will meet 2.6 rules for sled pulling.
Downside to it, is lag, i know that jacob says it spools similar to stock, but its super hard to beat factory turbos
Towing is also unproven on a single
Ok now to twins
Tow powers are a good option, probably drop egts just a little, and be driveable just like stock, power will be minimal gains over stock, you will also be limited to about a 60hp nozzles and about 725 peak hp, but if thats your goal then perfect.
High powers, spool as good as stock, WILL do 650 hp on a bone stock fuel system, and cool egt's a good amount. Also you will be able to run probably a 110 injector and aggressive fueling and make over 750 hp with the turbos, so if your plan is to grow these arent a bad option either
Downfall is price, the turbos are expensive units for a reason, they are good turbos that flow a ton of air for the size
Another downfall to me is how much room the turbos take up in the valley, if there is ever any issues with anything the cab has to at least come up about 4 inches to work on it, which to some isnt a huge issue but for some it might be, but to me the downsides dont even match how good the turbos are, if i had a stock fueled truck these are what i would spend the coin on.