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SP Concepts

2006-2017 DYNA - Big Bore 4.5

2006-2017 DYNA - Big Bore 4.5

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$1,739.99
$1,739.99
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  • 4.5” high flow performance rolled cone muffler with stepped baffle from 2 ¼ to 2 ½ inches. Increases bottom to mid range torque and horsepower on all motors. Tuned properly can accommodate 88" to 143".
  • 065 stainless steel headers, stepped from 1 ¾” to 1 7/8” to 2” at the collector
  • Hand tig welded from top to bottom
  • Machined stainless steel header collars
  • 18mm o2 bungs with 12mm adapters, allows for stock or autotune sensors
  • Complete hardware kit with everything you need to mount it up
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