Boyesen Power Reeds use a patented dual-stage fiberglass design for more airflow, more air velocity and more overall power. This item fits the following applications: 1998-2011 KTM 65 SX, 2001-2008 KTM 50 Mini Adventure, 2002-2007 KTM 50 SX Pro Junior LC, 2001-2007 KTM 50 Senior Adventure, 2001-2006 KTM 50 SX Pro Senior LC, 2000-2003 KTM 50 Junior Adventure.