Yamaha Tunnel Kit: 2008-2009 MTX Tunnel kit will fit a 153" tunnel or can extend to accommodate a 162" track. Kit will allow the tunnel to be tapered or narrowed or both. Easy Installation/No Modifications Necessary All Parts Included (Diagonal tunnel Supports, lightweight strong rear Bumper, tunnel extension piece and hardware.) Looks Great Slight reduction in weight depending on narrowing and tapering of tunnel.