This is a Shelby GT500 5.4L 4V Modular crate engine on display in the Vortech / Paxton booth at the 2008 SEMA show. This Ford Racing crate motor is upgraded with a new Vortech VL supercharger. The supercharger is made by Lysholm and packaged by Vortech. Vortech / Paxton will be the only supercharger manufacturer in the U.S. to offer both centrifugal and twin-screw blowers.