Is Your E46 M3 Overheating?

The E46 M3 front air intake duct works just fine, but overtime the plastic gets brittle and the bottom portion of the duct tends to bow. This causes air to slip past the oil cooler and radiator limiting the maximum air for cooling. In addition, you do not want air to escape past the cooler/radiator as this will cause unwanted lift. Without getting too technical on aerodynamics, you want to keep faster moving air below the bumper and slower moving air on top.

Our Buildjournal Radiator Duct for the E46 M3 is an all-aluminum piece to avoid any future bowing due to wear and tear. It’s also lightweight at just 3 lbs. The install is also super easy. We’ll show you how to install it.

⚠️ Currently this product has not been tested with aluminum reinforcement front bumper beams found on earlier E46 M3 models.

Parts List

  • (2) End plates
  • (1) Bottom plate
  • (4) M6 Nutserts
  • (4) M6 Hex Head Bolts
  • (4) M6 Button Head Bolts
  • (4) M6 Nylon Nuts

Tools Required

  • 10mm socket/wrench
  • 4mm allen key
  • Nutsert tool
  • 9mm or 23/64" drill bit

2

Hours

2/5

Difficulty

Install Directions

1. Remove Bumper

2. Remove bumper reinforcement beam/bar

3. Remove OEM radiator shroud

Note: OEM radiator shroud can be trimmed to keep existing ducts for upper kidney

4. Find the (4) OEM holes on the radiator support bracket and drill using a 9mm or 23/64″ drill bit – there are 2 on each side

5. Install the provided M6 nutserts

6. Install the radiator duct using the supplied (4) M6 hex head bolts

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