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This is a rebuilt 871 (Stage 4) BDS Blower / Supercharger. The blower has the standard 2 rotors, each rotor has 3 lobes and each lobe has 3 strips of Teflon for increased boost pressure. This is a race blower and it is built for alcohol.
 
The price is for the blower only, without the intake manifold. The items in the photo are included.
 
It has not been ran since rebuilt by BDS. Blower Drive Service