Product Overview
Exile Stainless Steel Stihl MS661 dual port muffler
Performance Muffler Cover
POLISHED FINISH
Fits: STIHL MS661
100% Stainless steel
TIG Welded
Built-in spark arrestor screen (Regulation)
Polished finish
Lifetime guarantee
Installation: Stihl M-tronic saws will calibrate automatically, but a factory reset is recommended.
Non M-tronic saws MUST be tuned once installed.
Tuning with a digital tachometer, check RPM with stock muffler cover still on saw, swap stock cover install ported cover, check RPM with ported cover, set RPM back to stock original RPM
