Heres a comparison that demonsvt did comparing the ADC turbo kit and Vortech. ADC kit is $5000. Below is a list of things that needed to be added to the Vortech or are not included like they are with the turbo kit.
"No chip or tuning. $500 or more
No fuel upgrades $200-400 (injectors and pump)
Now it's $4500 vs $5000
No shaft support bearing ($300-500)
Now it's 5k vs 5k just to make the kit usable and maybe a little more reliable then it's 100% failure rate.
No intercooler. $1350+
Now it's $6350+ vs $5000
No headers. $650
Now it's 7k vs 5k...
...and guess what...
Still makes substancially less power across the board.
Still out run by a NA 3L.
Vorcrap is Vorcrap regardless of now selling less kit for more money."
Originally posted by Wyrp:
Superchargers run off the engine's belt, so the boost is always present. However, since the supercharger is powered by the rotation of the crank, a portion of the power gained is lost due to the additional resistence the motor must over come to drive the supercharger.
I would say this is more so true for a roots style setup, and is going to make that low end tq compared to the centrifugal that the contour uses which you have to wind out to redline to see full boost. Btw, for the newb, the ADC kit makes full boost at 2800 rpm's with the T-28 kit. 
Youll definetely feel a kick in the pants.
