Designed specifically for big bore quad applications to deliver maximum power Near stock sound levels and deep pleasing tone while providing lots of torque All stainless steel construction and internal disc design for durability and low maintenance Integrated Forest Service approved spark arrestor for safe riding Patented SuperTrapp Tuneable Disc Technology Adjust sound levels and powerband by adding or removing 3 in internal discs Pillow Pack packing lasts longer with superior silencing This product can be used with Yamaha 660 Rhino 05-06