WCS Stihl MS500i and the MS661 Air Cleaner System

West Coast Saw Air Cleaner system for Stihl MS500i and the MS661.   Introducing a new concept in air cleaner design. This innovative system includes an exterior cage, high-density foam, and a polyurethane bushing, which captures dirt and foreign particulates more efficiently than paper or gauze. Whether you're a professional or a heavy-duty chainsaw user, this product provides the filtration quality you can rely on.   FEATURES:   Increased surface area, including breathability from the back side of the filter.   Polyurethane bushing prevents particulates from entering through the stud.   Crafted to fit perfectly under your chainsaw's factory hood, offering a simple modification for improved engine protection. Includes one external cage and bushing, plus two washable foam filters.   Comes with an instructional card that includes how-to videos. FITS:    Stihl 500i   Stihl 661 IMPORTANT NOTES:   This filter requires oiling with a foam filter oil (Do NOT use spray oil). To complement this,