MaxFlow® High-Flow Air Filter Conversion Kit for Stihl MS500i (HD2 Filter Models)

The best chainsaw Stihl has ever built just got better — the MaxFlow® High-Flow Air Filter Kit for MS500i is now available. This complete, patent-pending conversion kit maximizes airflow while maintaining full protection, giving your fuel-injected MS500i smoother running, more power, and dramatically longer run times between cleanings — even in heavy dust.

Engineered from the ground up specifically for the MS500i’s HD2 polyolefin filter system, every component is new: a full-size MaxFlow cage with grey lid, custom baffled all-season cover with integral rain/brush guard, and two premium washable foam elements (green for standard conditions, white for extreme dust).

Complete Kit Includes:

• MaxFlow® high-flow cage with grey lid
• OEM-compatible baffled all-season cover (rain & brush protection)
• Two washable high-flow foam elements:
  • Green – for standard cutting conditions
  • White – for extra-dirty / extreme dust environments

Key Benefits:

• Up to 30× longer life than stock HD2 pleated filter
• Full CFM airflow – more power & cooler running
• 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 (MSE SAG HS type A) – safe for Forest Service property
• Direct fit using factory mounting locations
• Made in the USA – trusted by pros for over 30 years

Installation Video Guide:

Watch this step-by-step installation video for easy setup (minor baffle customization may be needed based on your cutting style):
MaxFlow MS500i Kit Installation Video

Compatibility:

• Stihl MS500i (all HD2 filter-equipped models)

More power, less cleaning, zero downtime — upgrade your MS500i to the MaxFlow® High-Flow Air Filter Kit today. Proudly made in the USA and in stock at HL SUPPLY!