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The Supersprint center resonator replaces the factory catalytic converter. This unit weighed in at 23.0 lb compared to 37.0 for the stock cats.
Project BMW M3 Part 6: Cams, header and pulleys

 The Supersprint center resonator replaces the factory catalytic converter. This unit weighed in at 23.0 lb compared to 37.0 for the stock cats.  View Related Article

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