- Boyesen's? patented dual-stage design incorporates a specially shaped top reed and a ported bottom reed
- The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs
- The stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs
- Allows replacement of stock reed stop with a Rev-Plate which permits the reeds to open freely and function efficiently
Polaris -- Predator 50 -- (2005, 2006, 2004); Polaris -- Scrambler 50 -- (2003, 2002, 2001); Polaris -- Outlaw 50 -- (2003, 2001, 2006, 2005, 2002, 2004); Eton -- RXL 50 Viper Mini -- (2005, 2002, 2007, 2004, 2006, 2001, 2003); Eton -- TXL 50 -- (2003, 2007, 2006, 2002, 2001, 2005, 2004); Eton -- TXL Impulse 50 -- (2005, 2006, 2003, 2007, 2004, 2002, 2001); Eton -- RXL 50 Viper -- (2002, 2005, 2006, 2007, 2004, 2003, 2001); Eton -- AXL 50 Lightning -- (2001, 2002, 2003, 2005, 2007, 2004, 2006); Eton -- NXL 50 Lightning -- (2003, 2007, 2002, 2005, 2001, 2004, 2006); Kasea -- Skyhawk 50 -- (2003, 2002, 2004)