Hitachi 6696554 Genuine Replacement Muffler

When a muffler on your Hitachi or Tanaka outdoor power equipment cracks, corrodes, or blows a gasket seal, the right fix is an OEM replacement — and the 6696554 is exactly that. Aftermarket mufflers for small engines often look close enough but introduce fitment gaps at the exhaust port, which causes exhaust leaks, backpressure loss, and can accelerate engine wear. This genuine Hitachi part is manufactured to the same specification as what left the factory, which means proper port alignment, correct heat ratings, and confident gasket seating.

Installation follows standard small-engine muffler procedure — remove the old unit, transfer or replace the gasket, torque the mounting hardware to spec. The part is designed for Hitachi and Tanaka branded outdoor power equipment across their range, so confirming the part number against your model's parts diagram is the one critical step before ordering. At 90 days, the warranty is functional but not generous for a part that lives in a high-heat environment. That said, genuine OEM parts routinely outlast aftermarket versions when installed correctly — the materials and tolerances are simply better matched to the application.