Part Number 2128491 / 2128491 Muffler DirectFit Replacement for CAT E311D E311C E312C E312D E314D E314DL Key benefits Directfit replacement for listed engine models, designed to match original equipment fit and function for straightforward installation. Restores exhaust containment and noise attenuation to maintain a safe and comfortable operating environment. Helps preserve proper exhaust flow and backpressure to support reliable engine operation. Durable construction for long service intervals and reduced downtime compared with waiting on temporary fixes. What this muffler does Controls exhaust noise and directs exhaust gases away from the machine. Replaces a damaged or worn muffler to eliminate leaks, rattles, and excessive noise. Fits the specified engine family to ensure alignment with existing mounts and exhaust piping. Compatibility Part numbers 2128491 and 2128491 Fits CAT E311D, E311C, E312C, E312D, E314D, and E314DL engines Practical attributes Function: Exhaust noise reduction and gas routing. Fit: Directfit design for the listed engine models. Performance: Maintains correct exhaust flow characteristics expected for the engine family. Identification: Supplied as the replacement unit corresponding to part numbers above. Typical use scenarios a corroded muffler during routine maintenance on construction excavators equipped with the listed engines to restore proper exhaust function and reduce operator noise exposure. Swap a damaged muffler after impact or road debris strike on a service vehicle or tracked machine to prevent exhaust leaks and subsequent performance issues. Fit a muffler during engine overhaul or retrofit to ensure the exhaust system returns to original alignment and operating characteristics. Notes Confirm part number and engine model compatibility before ordering to ensure proper fit. Designed as a direct replacement muffler for the listed engine models and part numbers only.