Posted for "George Braly" <gwbraly@gami.com>:

 Rick,
 
 This is not a question of who sells what.
 
 It is a question of the physics.
 
 The fundamental problem with  superchargers   whose speed is a multiple of
the speed of the crank shaft is - --  the speed is a fixed multiple of the
crank shaft when it VERY VERY much needs to be a variable speed, not fixed.
 
 That fundamental limitation is what defines the source of the inefficiencies
with fixed ration superchargers - - belt driven,  gear driven, or otherwise.
 
 Regards,  George