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I see several models of ball drive. I am guessing that the SN series is pretty much all the same (SN89, SN92, SN93, SN2000). What I dont know is how the VR4 and the GSS fit into this? The VR4 at least looks similar to the SN series. I dont think I have ever seen a GSS.
Educate me.
According to Paradise Wheels the Novi GSS is identical to the SN-2000. Paxton named the GSS/2000 ball drive "Novi GSS" but later changed the name to SN-2000 when they decided they wanted to use the Novi name for the gear driven superchargers.
VR4 is same but different, VR4 has 4" inlet 3.5" discharge and the impeller is 1/2" wider to move more air volumn and also moves 1400 cfm and makes 15psi. The VR4 in 89-92 was used for Renegade racing and had the racers in the 9's.