If you find that the aftermarket M4 exhaust on your 2017 Yamaha FZ-07 is producing excessive noise and you want to muffle it, there are a few options you can consider:
Check Local Regulations: First and foremost, make sure to familiarize yourself with local noise regulations to ensure that your motorcycle's noise levels comply with legal requirements.
Repack the Exhaust: Some aftermarket exhaust systems have removable sound baffles or inserts that can be repacked with sound-absorbing materials. Check if your M4 exhaust has this feature and consider repacking it. Contact M4 or a reputable motorcycle exhaust shop for guidance on the process and suitable materials.
Install a Quieter Insert or Baffle: If your exhaust does not have removable baffles or inserts, you can explore the possibility of installing an aftermarket insert or baffle specifically designed to reduce noise levels. These inserts are often available from exhaust manufacturers or aftermarket suppliers and can help decrease the overall volume of the exhaust.
Custom Silencer/Muffler: Another option is to have a custom silencer or muffler fabricated and welded onto your existing exhaust system. This can be done by a professional exhaust shop, who can design a solution that meets your desired noise level while ensuring proper backpressure for optimal performance.
Seek Professional Advice: It's advisable to consult with a reputable motorcycle mechanic or an exhaust specialist who can assess your specific situation, inspect the exhaust system, and provide tailored recommendations based on their expertise and experience.
Remember, modifying the exhaust system may affect the performance and backpressure of your bike. It's important to strike a balance between reducing noise and maintaining proper functioning. Always consult with professionals who have experience with exhaust systems to ensure you make informed decisions and maintain the safety and performance of your motorcycle.