I just got back my 93 Viper from the Paxton/Vortech plant 3 weeks ago. They used it to develop/build a Supercharger for Gen I's. I was given a tour of the complete plant which is located in Oxnard.
Dynodaddy is correct, Vortech and Paxton are together in the plant and owned by Vortech. There plant is state of the art and immuculate. The engineer that designed the Paxton Suercharger for my GenI was a Vortech Engineer. Paxton/Vortech are Outstanding Supercharging units, at least on my Viper. My Gen I runs great with their Novi 2000 unit & their inter-cooler.
For what it's worth, both Roe and Paxton are Great units! Each unit is designed different when it comes to specific rpm/curve power range. When set up correctly, both are in my opinion, the best thing since slice bread. What a feeling to drive a Supercharged Viper!