The Rotrex C15-16 supercharger is the smallest Rotrex C15.

The Rotrex C15-60 supercharger is the largest of the compact C15 line of Rotrex superchargers. 

The Rotrex C30-74 supercharger is an extremely versatile supercharger, and can fit a range of applications.

The Rotrex C30-94 supercharger is the largest Rotrex C30 and extremely versatile.

The Rotrex C38-61 supercharger is the smallest C38, and can fit a wide range of applications.

The Rotrex C38-71 supercharger is a medium range C38.

The Rotrex C38-81 supercharger is a medium range C38 made for bigger engine packages.

The Rotrex C38-91 supercharger is the newest C38 and is the most powerful Rotrex available.