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Flange: 5/16"; base: 1-1/2"; top: 1-1/2"; height: 1-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 3/4"; base: 2"; top: 2"; height: 1-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 1"; base: 2"; top: 2"; height: 1-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 1-3/8"; base: 3"; top: 3"; height: 2-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 1-3/8"; base: 3"; top: 3"; height: 2-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 1-1/2"; base: 3"; top: 3"; height: 2-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 1-1/2"; base: 3"; top: 3"; height: 2-1/2". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Flange: 3"; base: 4-1/4"; top: 3"; height: 5". This filter protects your engine from oil-contaminated air that flows from the crankcase back into the air intake system. Polyurethane construction is long-lasting.

Performance air filter is a direct replacement for the filter in your Bully Dog Rapid Flow CAI (BY51100, BY51101, BY51103, BY51105). Eight layers of mesh block out more than 99 percent of dirt and debris. Filter is washable and reusable.

Performance air filter is a direct replacement for the filter in your Bully Dog Rapid Flow CAI (BY53101, BY53102, BY53252, BY53253). Eight layers of mesh block out more than 99 percent of dirt and debris. Filter is washable and reusable.

Performance air filter is a direct replacement for the filter in your Bully Dog Rapid Flow CAI (BY52101, BY53100, BY53200). Eight layers of mesh keep more than 99 percent of dirt and debris from reaching your engine. Filter is washable and reusable.

Performance air filter is a direct replacement for the filter in your Bully Dog Rapid Flow CAI (BY52100). Eight layers of mesh keep more than 99 percent of dirt and debris from reaching your engine. Filter is washable and reusable.

Performance air filter is a direct replacement for the filter in your Bully Dog Rapid Flow CAI (BY51200). Eight layers of mesh keep more than 99 percent of dirt and debris from reaching your engine. Filter is washable and reusable.

Performance air filter is a direct replacement for the filter in your Bully Dog Rapid Flow CAI (BY54100). Eight layers of mesh keep more than 99 percent of dirt and debris from reaching your engine. Filter is washable and reusable.