{"title":"Exhaust Products","description":null,"products":[{"product_id":"undaunted-mfg-500i-muffler-cover","title":"Undaunted MFG 500i Muffler Cover","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh-Performance Exhaust Cover for STIHL MS 500i\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEngineered for increased power and improved engine cooling, this high-performance exhaust cover is precision CNC machined from 6061-T6 billet aluminum, a high-strength, aerospace-grade alloy known for excellent heat dissipation and durability. Built for demanding conditions and proudly made in the USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCompatible Models:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTIHL MS 500i\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWhat's Included:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOne-piece exhaust cover, stainless steel intermediate plate, spark arrestor screen with aperture size compliant with USFS specifications, high-temperature gasket, complete hardware kit, and Loctite 243 Threadlocker (0.5 ml bottle).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eStainless Steel Intermediate Plate:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe included intermediate plate helps distribute exhaust flow, refine the exhaust note, and extend spark arrestor screen life without compromising performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDyno Proven Performance:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTested on a completely stock saw with no modifications other than the exhaust cover. Results showed a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e7.93% increase in horsepower and an 8.25% increase in torque.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePerformance gains will vary depending on the saw and the level of modification.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Notes:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAfter installation, allow the saw to reach operating temperature and perform five bucking cuts to allow the fuel injection system to adapt to the increased exhaust flow.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApply the supplied threadlocker to all mounting screws and torque to the values specified in the installation instructions. Retorque after the first few heat cycles and periodically check torque as part of routine maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eExhaust Sound:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncreased exhaust noise is expected compared to the factory exhaust. Proper hearing protection is essential and should always be worn.\u003c\/span\u003e\u003c\/p\u003e","brand":"Undaunted Mfg","offers":[{"title":"Default Title","offer_id":53269852913948,"sku":null,"price":115.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/5001.webp?v=1791915393"},{"product_id":"undaunted-mfg-ms261-full-exhaust","title":"Undaunted Mfg MS261 Full Exhaust","description":"\u003cp\u003e\u003cspan\u003eEngineered for increased power and improved engine cooling, this high-performance exhaust system is precision CNC machined from 6061-T6 billet aluminum, a high-strength, aerospace-grade alloy known for excellent heat dissipation and durability. Built for demanding conditions and proudly made in the USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCompatible Models:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTIHL MS 261 \/ MS 261 C \/ MS 261 C-M (M-Tronic Version 3.0+ only)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Not compatible with M-Tronic Version 2.0 or earlier due to limited fuel adjustment capabilities. Carbureted models are fully compatible.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHow to Check Your M-Tronic Version:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eVersion 3.0+ saws are typically manufactured in 2019 or later. Verify the control module part number or consult a STIHL dealer to confirm compatibility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOutlet Direction (Facing Bar or Facing Recoil):\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cspan\u003eFacing Bar\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e means the exhaust outlet points toward the guide bar side of the saw. \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eFacing Recoil\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e means it points toward the pull-start side. This is strictly operator preference and has no effect on performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWhat's Included:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBillet exhaust base, one-piece exhaust cover, high-temperature gasket (between cover and base), spark arrestor screen with aperture size compliant with USFS specifications, complete hardware kit, and Loctite 243 Threadlocker (0.5 ml bottle).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDyno Proven Performance:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTested on a completely stock saw with no modifications other than the exhaust. Results showed a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e13.70% increase in horsepower and a 12.30% increase in torque.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePerformance gains will vary depending on the saw and the level of modification.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Notes:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePost-installation tuning or recalibration is required for optimal performance. Follow the appropriate STIHL M-Tronic calibration procedure for equipped models.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApply the supplied threadlocker to all mounting screws and torque to the values specified in the installation instructions. Retorque after the first few heat cycles and periodically check torque as part of routine maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eExhaust Sound:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncreased exhaust noise is expected compared to the factory exhaust. Proper hearing protection is essential and should always be worn.\u003c\/span\u003e\u003c\/p\u003e","brand":"Undaunted Mfg","offers":[{"title":"Default Title","offer_id":53269861663004,"sku":null,"price":158.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/2611.webp?v=1791915582"},{"product_id":"undaunted-mfg-462-muffler-cover","title":"Undaunted MFG 462 Muffler Cover","description":"\u003cp class=\"MsoNormal\"\u003eEnhance power and improve engine cooling with this precision-engineered exhaust system designed for the STIHL MS 462. 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: MS 462, MS462 C, MS462 C-M\u003c\/b\u003e\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 4% increase in horsepower and a 5.3% increase in torque.\u003cbr\u003ePerformance 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":53770542383388,"sku":null,"price":105.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/4621.webp?v=1791915870"},{"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":105.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/6611.webp?v=1791915802"},{"product_id":"undaunted-mfg-400-362-muffler-cover","title":"Undaunted MFG 400\/362 Muffler Cover","description":"\u003cp class=\"MsoNormal\"\u003eEnhance power and improve engine cooling with this precision-engineered exhaust system designed for STIHL MS 362 and MS 400. 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\u003cspan\u003e \u003c\/span\u003e\u003cb\u003eMS 362 and MS 400 (only fits saws with a two piece muffler)\u003c\/b\u003e\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 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 6.80% increase in horsepower, and a 12.26% increase in torque. Performance gains will vary depending on the saw and the level of modification.\u003c\/p\u003e","brand":"Undaunted Mfg","offers":[{"title":"Default Title","offer_id":54262712992028,"sku":null,"price":105.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/4003.webp?v=1791915679"},{"product_id":"309-billet-exhaust-port-echo-cs-620p-cs-590-timber-wolf","title":"309 Machine Billet Exhaust Port – ECHO CS-620P \/ CS-590 Timber Wolf","description":"\u003cp\u003eA CNC-machined billet aluminum exhaust outlet for the ECHO CS-620P and CS-590. Bolts onto the factory muffler with stock hardware — no muffler modification required — and works with the factory spark arrestor.\u003c\/p\u003e\n\u003cp\u003eThe stock stamped-steel outlet on the ECHO 620 and 590 is one of the biggest restrictions on these saws. We designed and machined this billet exhaust port in-house at 309 Machine to fix that. It gives the saw a larger, directed outlet that lets the engine breathe while keeping exhaust aimed away from the operator.\u003c\/p\u003e\n\u003cp\u003eEach port is machined from solid 6061 aluminum on our 5-axis machine, then black anodized and laser-engraved. It's made to look like it came on the saw, not like it was added later.\u003c\/p\u003e\n\u003cp\u003eIt's a true bolt-on. It uses your factory hardware, needs no cutting or drilling on the muffler, and keeps the factory spark arrestor screen in place. Pair it with baffle removal if you want even more flow.\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined from solid 6061 billet aluminum — not cast or stamped\u003c\/li\u003e\n\u003cli\u003eReplaces the factory stamped-steel deflector\u003c\/li\u003e\n\u003cli\u003eBlack anodized finish for corrosion and heat resistance\u003c\/li\u003e\n\u003cli\u003eDirected outlet keeps exhaust flowing away from the operator\u003c\/li\u003e\n\u003cli\u003eWorks with the factory spark arrestor screen\u003c\/li\u003e\n\u003cli\u003eBolts on with factory hardware, no muffler modification required\u003c\/li\u003e\n\u003cli\u003eCompatible with baffle removal for additional flow\u003c\/li\u003e\n\u003cli\u003eDesigned and made in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eECHO CS-620P\u003c\/li\u003e\n\u003cli\u003eECHO CS-590 Timber Wolf\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e(1) 309 billet exhaust port (reuses your factory mounting hardware)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInstallation \u0026amp; Tuning\u003c\/h4\u003e\n\u003cp\u003eRemove the factory outlet cover, set the 309 Machine port in place over the spark arrestor screen, and reinstall the factory screws. Because the saw will flow more air, check your carb tune after installing — especially if you also remove the baffles. We recommend having your carburetor adjusted to avoid running lean.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eFor off-road \/ professional use. Check your local spark arrestor and emissions requirements. 309 Machine is not affiliated with or endorsed by ECHO Inc. \"ECHO\" is used only to describe compatibility.\u003c\/em\u003e\u003c\/p\u003e","brand":"309 Machine","offers":[{"title":"Default Title","offer_id":54898682855708,"sku":null,"price":69.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/files\/IMG_5491_547a32f4-9a92-47bc-8935-0733ac27af09.jpg?v=1794422074"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0850\/2453\/8908\/collections\/IMG_5491_547a32f4-9a92-47bc-8935-0733ac27af09.jpg?v=1794422687","url":"https:\/\/309machine.com\/collections\/exhaust-products.oembed","provider":"309 Machine","version":"1.0","type":"link"}