FMF Q4 S/A '98-02 YZ/WR 400/426F 44291

FMF Q4 S/A '98-02 YZ/WR 400/426F 44291. The vendor part number is 44291. Read title carefully to know what you are getting. Here is the catalog descrion NOT the title?

• Incorporates internal baffles, chambers and space age sound-absorbing materials to accelerate exhaust flow with less noise and minimal power loss
• Well under the 96db sound output on most machines to satisfy strict sound requirements
• U.S. Forestry approved Spark arrestor with maintenance free, stainless steel spark arrestor screen