Briggs & Stratton 5099K Air Filter Upgrade Kit - 3.0 - 5 HP / CV (Replaces all Briggs & Stratton Foam Filters) Foam Filter Upgrade Kit For all Briggs & Stratton Foam Filters on Classic, Sprint, Quattro, Q 45, and 300 through 550 Series Engines Genuine Briggs & Stratton Part