Last night I rode in my friends 00 V6 that has the 11 PSI Procharger on it. It felt like it was pulling as hard as my moms 98 Cobra. I was most impressed. He had some tuning issues with it though, the chip he got didn’t work for his car and he had to send it back 3 times before he could get the car to work. But he finally got it dyno tuned so now it's working fine.
After I order my pistons I’m going to start saving up for that 11PSI kit. I think the ProCharger is a far superior kit because it comes with the intercooler where as the Vortech you have to pay extra to get one.