Check out the VR4 information in the SN section, pass it along to your buddies
as we are trying to get these kits made up again for 600.00. Larger Input and Output diameters on the rear cover and a larger Diameter impeller with more veins. Doubles the Boost PSI and CFM output of an SN-2000 cheap Horsepower for 600.00. If you are interested e-mail me at:

Thanks for your interest,