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SpeedFactory Racing Block Off Plug Billet Aluminium B-Series Black Mishimoto Performance J-Series skid plate andThe SpeedFactory Billet B Series Breather Port Plug was designed specifically for use on Honda Acura B Series engines to block off the OEM "black box" breather port. This allows you to utilize the (2) M28 threaded holes on the back of the engine block for your aftermarket oil catch can breather system, resulting in the proper crankcase ventilation your high performance engine needs. We recommend thoroughly cleaning the port in the block and the plug