Hard for normal engines to breath at 4300 ft
Those G-tech performance charts at STS showing before & after Turbo are telling an important story. Normally aspirated engines have a hard time "breathing" at 4,300 ft elevation. UTAH is where STS offices are, so of course they offer 0-60 MPH and HP / TORQUE charts for that altitude.
The charts show a 36% increase in peak torque, very nice. A 20% reduction in 0-60 MPH elapsed time.
That same Turbo truck from the charts will kick serious butt at sea level, when it has relatively dense air to work with (= bigger boost). Yes, it will need some serious octane gas to do it, but that goes for any hi-perf engine. So think about this before raising the BS flag very high. I think this turbo stuff is for real, and a great alternate (or addition) to other hi-perf mods. For now I am waiting for my S&S Headers to arrive (2 more weeks?).