BMC CDA Carbon Dynamic Filter The BMC CDA filtering system replaces the stock air box with a cylindrical carbon air box containing a washable filtering element. Cold air is directly channelled through an internal airflow deflector to the filter and drawn into the engine with a very small pressure drop (patented system). System includes 2 Ft. of black alloy ducting to connect to an air intake on the front of the car. Dyno and Datron Laser tests demonstrate substantial HP gains with the CDA filtering system.
BMC CDAs have 2 basic dimensions, diameter of the attachment to the engine intake manifold and the size of the canister. The most important is the size of the canister, this is designed to maximize the performance of your engine without risk of damage. In the diagram below, D1 is the canister size and D2 is the diameter of the air intake. The air intake side can be modified to fit your engine or there are adaptors available from BMC (e.g. 85mm to 70 mm nylon reduction adaptors.)