MaxFlow® High-Flow Air Filter Conversion Kit for Stihl MS660 / 066 HD Models

The original high-performance upgrade trusted by pros for 30 years — the MaxFlow® Air Filter Kit is designed specifically for HD-filter equipped Stihl MS660 and 066 Magnum saws. This kit replaces the restrictive stock pleated filter with a high-flow washable system that delivers smoother running, more power, and dramatically longer run times in dusty conditions.

Why settle for imitations? MaxFlow® is the only aftermarket filter 100% USFS approved (MSE SAG HS type A) — safe for Forest Service property with no risk of shutdown.

Complete Kit Includes:

• MaxFlow® high-flow cage
• Custom-fit rain cover
• Nut plate – for running without rain cover
• Two premium washable foam elements:
  • Green – optimized for standard cutting conditions
  • White – extra protection for extreme dust & dirty environments

Key Benefits:

• Up to twice the runtime of stock pleated filters
• Full airflow – more power & cooler running in adverse conditions
• Washable & reusable – lower cost & less waste (use foam filter oil – sold separately)
• One-piece seamless foam elements – no glued seams to fail
• 100 % USFS approved – safe for government land
• Made in the USA – proven reliability for 30+ years

Compatibility:

Direct fit for HD-filter equipped models:

• Stihl MS660MHD, MS660MRHD
• Stihl 066 Magnum HD, 066 Magnum R HD

Note: For non-HD (fleece, flocked, or screened filter) saws, additional Stihl HD backing plate and parts are required (not included).

Replaces Stihl OEM filters: 1124-120-1620 / 0000-120-1654

More power, less cleaning, zero downtime — upgrade your legendary MS660 or 066 to the original MaxFlow® High-Flow Air Filter Kit today. Proudly made in the USA and in stock at HL SUPPLY!