US Patent 7383810 Air induction system having an integrated resonator

An air induction system for carrying air to the intake of an internal combustion engine includes an air cleaner housing including a surface at least partially enclosing a first chamber or cover located in the air cleaner housing, an inlet through which air enters the air cleaner, and a MAFS bore through which air exits the air cleaner and passes to the engine intake, a second housing secured to the outer surface, the second housing and outer surface enclosing a second chamber, the second housing including a first port which comprise a sound attenuation device or devices.