HPI Racing is proud to introduce a new Air Cleaner for Savage trucks and most big block 21+ engines! Dual layers of micro density foam help provide maximum air filtration for extended engine life, even in dusty conditions. The filter element size has been increased, which helps extend the time between routine filter cleanings. The neck of the filter has been extended so that the filter is now located safely under the roll hoop and away from the spur gear. The new design allows access for cleaning without removing the filter from the engine, which makes disassembly, cleaning, and reassembly a snap. The inner filter comes pre-oiled and ready to use right out of the package! This air cleaner fits .21 to .28 nitro engines sizes.