Vance & Hines Monster Round Catalytic Slip-Ons - Chrome (Harley Davidson)

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Monster Round Catalytic slip-ons house two three-way catalytic converters and have been tested with Vance & Hines Power Duals or Dresser Duals to demonstrate that they meet emissions standards applicable in California. The real benefit of combining Vance & Hines Power Duals or Dresser Duals with the new Monster Round Catalytic slip-ons lies in the movement of the catalytic converter from the front half of the exhaust (as it is in the original equipment exhaust) to the back half of the exhaust, which yields a significant reduction in heat felt by the rider - this affects riders everywhere, not just in Cali! Monster Round Catalytic slip-ons make just as much power as standard Monster Round slip-ons, along with the same deep and mellow tone riders have come to love. And the finish is every bit as top-notch, sporting full coverage heat shields and machined billet end caps. In California, aftermarket part applications that have been identified specifically as replacement parts or have received an Air Resources Board Executive Order may be used on street and off-road motorcycles.


  • 4" monster round muffler bodies
  • CNC-machined end caps
  • Full-coverage heat shields
  • Available in chrome or black finish
  • Fits saddlebags with extended skirts
  • Sold as a pair
  • Made in the USA