{"product_id":"undaunted-mfg-661-muffler-cover","title":"Undaunted MFG 661 Muffler Cover","description":"\u003cp class=\"MsoNormal\"\u003eEnhance power and improve engine cooling with this precision-engineered exhaust system designed for the STIHL MS 661. Made from lightweight 6061 T6 billet aluminum, a high-strength aerospace alloy known for excellent heat dissipation, the one-piece muffler cover optimizes exhaust flow while helping to keep your engine cooler and extend component life.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eProudly manufactured in the USA and backed by a lifetime warranty, this exhaust system delivers lasting durability under demanding conditions.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eCompatible Models:\u003c\/b\u003e\u003cbr\u003eSTIHL MS 661\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eIncludes:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\"\u003eOne-piece muffler cover CNC machined from 6061 T6 billet aluminum\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eSpark arrestor screen with aperture size compliant with USFS specifications\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eHigh-Temperature Gasket – Made in the USA\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eLonger stainless steel top screws with vibration-resistant Belleville washers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eDyno Proven Performance\u003c\/b\u003e\u003cbr\u003eTested on a completely stock saw with no modifications other than the muffler cover. Results showed a 6.21% increase in horsepower, and a 9.92% increase in torque. Performance gains will vary depending on the saw and the level of modification.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eInstallation Notes:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\"\u003eApply thread locker on all mounting screws for secure, vibration-resistant assembly\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003ePost-installation tuning or recalibration is required for optimal performance\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Undaunted Mfg","offers":[{"title":"Default Title","offer_id":53770552541468,"sku":null,"price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/IMG_5925.webp?v=1769024026","url":"https:\/\/309machine.com\/products\/undaunted-mfg-661-muffler-cover","provider":"309 Machine","version":"1.0","type":"link"}