The 4 positions per side allow you to put more weight towards the heel or tip if you want to change your shift pattern for a harder hit out of the gate or more top end pull

you’ll have insane upshift

This is the ticket for an easy 5-8 MPH on most sleds

With the torsion spring full shift out is achieved

Spark Arrestor Kit 2.5" / BIG MO Aluminum Exhaust Category_Default Category/SXS/Exhaust The 4 positions per sideLooking to add a spark arrestor to your BMP extruded aluminum Big Mo exhaust? This kit comes with everything you need. Spark arresters play a critical role in the prevention of wildland fire and the ignition of explosive atmospheres. They are enforced by law.