BOYESEN SNOWMOBILE POWER REED (557E) ARCTIC CAT 400 ACT 4X4 This is a 2 letter

This is a 2 letter ratings system

The fiberglass bottom reed provides stability and longer reed life

Bolt Hole Spacing (Bhs) 116/116/79mm

FOR 11 GALLON TANKS

Mounting Holes: 7

BOYESEN SNOWMOBILE POWER REED (557E) ARCTIC CAT 400 ACT 4X4 This is a 2 letterBOYESEN SNOWMOBILE POWER REED 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. More valves equals more power More Air Flow. The dual stage design allows you to replace your stock reed stop with a Rev Plate