Billet MAF Housing - Hitachi Style (late) 85mm ID

Perfect for use in upgraded turbo cars with larger injectors and appropriate software
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Product Details

These 85mm Inside Diameter Hitachi MAF Housings are designed for use in modified B5 Audi S4/RS4 & C5 Audi A6/Allroad 2.7T cars running upgraded RS4 K04 or larger turbos with appropriate software and matching fuel injectors.

Precision CNC machined in-house from billet aluminum, these housings maintain a constant 85mm inside diameter, and can be used with 034 stock airbox adapters, or 3.5" silicone couplers.


  • Precision CNC machined to the tightest tolerences.
  • Constant 85mm inside diameter for use with most K04/BT software.
  • 3.5" or 89mm OD hose connections.
  • Precisely machined flange for Hitachi MAF element.
  • Engraved "034Motorsport" logo.

*Please Note: Optional airbox adapter pieces designed to work with either the factory S4 or RS4 airbox are sold separately.

**034 also carries an 85mm MAF housing for the earlier Bosch style MAF element, which is available as ES3419739

This Part Fits the Following Vehicles

Make Model Submodel Engine
Audi All Road All 2.7T
Audi B5 S4 All 2.7T
Audi C5 A6 Quattro 2.7T
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.
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