Waterboxer Exhaust Silencer - 1900cc (DH+DJ) - CAT Models

This replacement standard exhaust muffler (silencer) is designed for Volkswagen VW Type 25 / VW T3 buses fitted with 1.9 and 2.1 Waterboxer petrol engines that use a catalytic converter. It is a direct-fit solution for restoring original exhaust function, noise levels, and correct exhaust gas flow.

The silencer plays a crucial role in reducing exhaust noise while maintaining the correct back pressure required for efficient engine operation. Internally, the muffler uses baffles and chambers to control sound waves produced by the engine, ensuring a smooth and refined exhaust note without restricting performance. This is particularly important on Waterboxer engines, where correct exhaust flow contributes to drivability, fuel efficiency, and emissions control.

Manufactured to standard replacement specification, this exhaust silencer aligns precisely with the factory exhaust system on catalytic-converter-equipped models. It bolts directly between the exhaust pipework without modification, making it ideal for maintenance, MOT repairs, or full exhaust system refurbishment. The design supports long-term reliability while keeping the vehicle compliant with original emissions standards.

Engine & Vehicle Compatibility

• Engine Sizes:

  • 1.9 Waterboxer

  • 2.1 Waterboxer

• Engine Codes:

  • DH – 01/1983 to 07/1985

  • DJ – 08/1984 to 07/1992

• Vehicle Applications:

  • VW Type 25 / T3 Transporter (1983–1992)

  • Petrol models fitted with a catalytic converter only

Dimensions

• Flange to flange length: 650 mm

• Silencer body length: 600 mm

Fitting Information & Recommended Additional Parts

• Designed for vehicles already equipped with a catalytic converter

• Direct bolt-on replacement

• Recommended to replace at the same time:

  • Exhaust gaskets

  • Exhaust clamps

  • Mounting rubbers / hangers

Replacing worn exhaust mounts and seals at the same time helps prevent vibration, exhaust leaks, and premature failure of the new silencer.

Key Benefits

• Restores original exhaust noise levels

• Maintains correct exhaust flow and back pressure

• Compatible with catalytic converter systems

• Ideal for MOT compliance and everyday driving

• Direct-fit replacement for Waterboxer engines