Product Overview
STIHL MS661 DNO PERFORMANCE MUFFLER FACEPLATE + GRAPHITE CARBON GASKET
DNO FACEPLATES HAVE SLIGHTLY LARGER PORTS THEN THE CLUTCH SIDE EXIT.
BOLT-ON POWER - DYNO TESTED
SAW ENGINE RUNS COOLER
FITS: MS661
100% Stainless Steel
Polished Finish
TIG Welded
Removable Spark Arrestor Screen
HIGH TEMP GRAPHITE GASKET
Will need 2x m5 x 12 screws to replace the top smaller screws on the muffler cover.
This is just the faceplate not the whole Muffler
ALL PERFORMANCE SAW PARTS BACKED BY OUR 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
stihl ms661 dual port muffler
