Upgrade your turf equipment with the Ryan 4165704. 7 Top Muffler Guard. This durable guard is specifically designed for Ryan brand equipment and is compatible with part number 4165704. 7. Keep your turf care machinery protected and running smoothly with this must-have accessory. Say goodbye to costly repairs and keep your equipment in top shape with the Ryan 4165704. 7 Top Muffler Guard. Designed for easy installation and made from high-quality materials, this guard is a smart investment for any turf care professional. Enhance the performance and longevity of your equipment with the Ryan 4165704. 7 Top Muffler Guard.