The Vortech system uses a centrifugal charger. It's basically a turbo that builds boost in a linear manner up to redline. Predictable throttle response, but it means you won't make full boost until redline. Just food for thought: a T-92 turbo will make full boost sooner than any Vortech unit.

The Comptech unit usually is good for high 12's. I have yet to see a Vortech-charged S2k break 13's.

Shingo