Z50J Monkey (4L/5L common design), Gorilla exclusive up muffler. Can be attached to normal head or Z series (Minimoto product) head. This product is a stainless steel exhaust pipe and a stainless steel silencer. The exhaust pipe combines durability with a silencer design that eliminates waste and focuses on basic performance. The stainless steel silencer band and stay are durable. It is also buffed. Genuine heat guard (4L/5L) can be installed by bolt-on. This muffler allows you to enjoy high-spec customization while maintaining the original style.