FMF Q4 S/A YFZ450R '09 44301

FMF Q4 S/A YFZ450R '09 44301. The vendor part number is 44301. Read title carefully to know what you are getting. Here is the catalog descrion NOT the title?

• Developed over years of championship off-road racing
• Max sound output 96db; most models below 93db
• Pounds lighter than stock
• Use with stock or FMF header
• Built-in spark arrestor included
• Easy to repack