Difference between the ball drives?

[bluwhale]

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.

[PropheZ]

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.

[speedytang]

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.