| Carbon Fiber Off-Road Air Box - Part # 3001180 | walkerengineering.co | 999 USD | — | — |
| Sprint Car Box with Carbon Fiber Filter Lid, 6" Tall - Part # 3000768 / 3000767 | walkerengineering.co | 499.95 USD | — | — |
| Toyota Midget 2.25" Throat - Part # 3000595 | walkerengineering.co | 468 USD | — | — |
| Walker "Competition" Air Box 4" Tall - Part # 3000902-4 | walkerengineering.co | 390 USD | — | — |
| Engler 2.90" Throat - 1" Bell - Part # 3000005 | walkerengineering.co | 390 USD | — | — |
| Walker "Competition " Air Box - 6 " Tall - Part # 3000902-6 | walkerengineering.co | 390 USD | — | — |
| Fontana Engine Midget - Part # 3000206 | walkerengineering.co | 390 USD | — | — |
| 14" Round Dirt Late model / Modified Air Filter, Lid and Base, 3 piece kit, Part # 3000897 | walkerengineering.co | 375 USD | — | — |
| Carbon fiber Sprint Car Airbox - Qualifying Filter - Part # 3000768QF | walkerengineering.co | 363.09 USD | — | — |
| Midget Replacement Airbox 4" - Part # 3001093 | walkerengineering.co | 360 USD | — | — |
| NON-WING Mopar 410 - Part # 3000209 | walkerengineering.co | 358.8 USD | — | — |
| Esslinger Midget RSI and QT - Part # 3000004 | walkerengineering.co | 351 USD | — | — |
| Walker Performance Dual Filter System for Kinsler 8-Stack Fuel Injection 3000662 | walkerengineering.co | 351 USD | — | — |
| Trophy Truck 16" O.D. x 5" or 6" Tall, Dry Media Filter - Part # 3000993 | walkerengineering.co | 341.64 USD | — | — |
| Toyota Midget Filter 2.5" Throat - Part # 3000590 | walkerengineering.co | 325 USD | — | — |
| Universal Fit, High Efficiency Dry Media Filters - Part # 3001134 - 4.5" Flange, 10" Tall | walkerengineering.co | 310.44 USD | — | — |
| 14" x 4", 5" or 6" Tall, Dry Media Filter (3000204-4/5/6DM) - Part # 3000204-6DM | walkerengineering.co | 310.44 USD | — | — |
| 3001355 Air Cleaner Lid & Base System (BLACK) | walkerengineering.co | 297 USD | — | — |
| Dune Buggy / LS3, Off-road, Desert Racing, Tapered Air Filter - Part # 3001071 | walkerengineering.co | 269 USD | — | — |
| Universal Fit, High Efficiency Dry Media Filters - Part # 3001133 - 5.5" Flange, 8" Tall | walkerengineering.co | 263.64 USD | — | — |
| Universal Fit, High Efficiency Dry Media Filters - Part # 3001132 - 6" Flange, 8" Tall | walkerengineering.co | 263.64 USD | — | — |
| Geiser Chassis / 6100 Class Off-Road High Efficiency Dry Media Filter - Part # 3001034 | walkerengineering.co | 259 USD | — | — |
| Herbst Chassis Air filter for Off-road / Desert Racing - Part # 3000904 | walkerengineering.co | 259 USD | — | — |
| Off-Road air filter, Part # 3001215 | walkerengineering.co | 249.58 USD | — | — |
| 14" Dry Media Off-Road Filter, Part # 3000204-HPDM | walkerengineering.co | 236.16 USD | — | — |
| Off-Road Desert Racing 6100 Class Dry Media Air Filter (14" or 12" tall) - Part # 3001026 | walkerengineering.co | 221.76 USD | — | — |
| Sand Rail Special, Dune Buggy, LS1, LS3, Studded High Performance Air Filter - Part # 3001037 | walkerengineering.co | 215.99 USD | — | — |
| Universal Fit, High Efficiency Dry Media Filters - Part # 3001131 - 6" Flange, 8.5" Tall | walkerengineering.co | 185.64 USD | — | — |
| Universal Fit, 6" Flange, 8.5" Tall, Dry Media Filters - Part # 3001131 | walkerengineering.co | 179.94 USD | — | — |
| Air Filter Cleaning Fluid, 5 Gallon Bulk Size, 3000479 | walkerengineering.co | 178.2 USD | — | — |
| Weber-style dual-carb Filter, P/N: 3001056 | walkerengineering.co | 171.52 USD | — | — |
| Engler Injected Micro 1.875" - Part # 3000441 | walkerengineering.co | 150 USD | — | — |
| Universal Fit, High Efficiency Dry Media Filters - Part # 3001217 - 4" Flange, 7" Tall | walkerengineering.co | 149 USD | — | — |
| Carbureted Micro Filter - Part # 3000008 | walkerengineering.co | 149 USD | — | — |
| Engler Injected Micro 1.625" - Part # 3000441-2 | walkerengineering.co | 148.2 USD | — | — |
| Walker Performance Filtration Micro Sprint Carb Yamah a R6 600CC | truckandautopartsstore.com | 144.99 USD | 144.99 USD | — |
| 14" x 5" Tall Round Washable Filter - Part # 3000775 | walkerengineering.co | 120 USD | — | — |
| 14" x 4" Round Washable Filter, Part # 3000204 | walkerengineering.co | 120 USD | — | — |
| 2017 - 2019 Ford 6.7L Power Stroke Diesel High Performance Air Filter - Part # 3001022 | walkerengineering.co | 119 USD | — | — |
| Speed UTV, Off-Road, High Performance Air Filter, Part # 3001249 | walkerengineering.co | 110.74 USD | — | — |