MBRP Sport S/O Muffler Yamaha AT-6408SPUpgrade your Yamaha with the MBRP Sport S O Muffler (Part Number: AT 6408SP), designed to enhance your ride's performance while delivering a refined exhaust note. This high quality muffler is engineered to provide increased flow and power, making it an ideal choice for those looking to maximize their machine's potential. With its 4. 25 inch design, the Sport muffler offers a perfect blend of style and function. Constructed from durable 304 stainless