Automatics have 280HP with 283ft lbs torque
Manuals have 300HP with ~300Ft lbs torque.
300
I would say that for more power and efficiency, you should go with the twin turbo.
no power to starter on Nissan 300zx twin turbo
You can get quite a bit of boost with the BD-Power twin turbo kit, but it depends on your engine and how you mate the kit.
Turbo = 1 turbo, Twin Turbo = 2 turbos
There are several types of turbo chargers. · Single Turbo · Twin turbo · Twin Scroll turbo or Divided turbochargers · Variable Geometry turbo. · Twin charger
The BD-Power Super B twin turbo kit will work in any large truck, including nearly all Dodges.
225 hp for the es model (non turbo) 300 for the AWD twin turbo
it is possible to get up to 1500 hp from a 350, but you have to either supercharge or twin turbo it, and you have to change the heads, cam, exhaust, carb, everything.
Twin Turbo.
It's generally agreed that twin turbos spool quicker (less turbo lag) with more low end power. Single turbos usually have better performance in the upper half of the RPM range i.e. drag racing, but twin turbos are also usually smoother i.e. city driving. Twin turbos also generally larger and take up more space than a single turbo. Designed and implemented properly, they have comparable power.
Twin Turbo.