Aerospace-Grade Performance Exhaust System for STIHL MS 261 Series Engineered for superior power and cooler engine temperatures, this exhaust system is precision-crafted from aerospace-grade materials built to handle the toughest conditions. Proudly made in the USA and backed by a lifetime warranty, it delivers unmatched reliability and durability. Compatible Models:STIHL MS 261, MS 261 C, MS 261 C-M (Version 3.0+ only) Note: Not compatible with M-Tronic Version 2.0 or older. Early M-Tronic systems may not support this modification due to limited fuel adjustment capabilities. Carbureted models are fully compatible. How to Check Your M-Tronic Version:Version 3.0+ saws typically have a manufacture date of 2019 or later. You can also check the control module part number or consult a STIHL dealer for confirmation. Outlet Direction (Facing Bar or Facing Recoil):Facing Bar means the exhaust outlet points toward the guide bar side of the saw. Facing Recoil means it points toward the pull-start side. This is strictly operator preference and has no effect on performance. Premium Features: CNC machined from 6061 T6 billet aluminum, a high-strength aerospace alloy that dissipates heat much faster than steel, improving engine cooling and extending part life Includes muffler base, one-piece muffler cover, high-temp gasket (between cover and base), spark arrestor screen with aperture size compliant with USFS specifications, hardware kit, and Loctite 243 Threadlocker, 0.5 ml Bottle Dyno Proven PerformanceTested on a completely stock saw with no modifications other than the muffler. Results showed a 13.70% increase in horsepower and a 12.30% increase in torque.Performance gains will vary depending on the saw and the level of modification. Installation Notes: Post-installation tuning or recalibration is required for optimal performance Use Loctite 243 thread locker on all mounting screws for secure, vibration-resistant assembly Warranty:Lifetime warranty covers defects in materials and workmanship under normal use; exclusions apply for misuse, neglect, or unauthorized modifications.
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