Air Intake Carbon Racing Filter for BMW 1 Series Coupe E82 1M Coupe HP 340 (2011-2012)

The Wrench Time

• Estimated Time: 45-60 Minutes
• Difficulty: 4/10 – Straightforward driveway bolt-on, but requires patience around heat-cycled plastic lines on the N54 platform.

Tools You Will Need

• 10mm socket and ratchet (for battery terminal and OEM mounting bolts)
• 8mm socket (for cowl tray and engine cabin filter housing)
• 6mm / 7mm nut driver or flathead screwdriver (for intake tract hose clamps)
• T20 Torx driver (if securing factory sensor or ducting hardware)
• Plastic trim pry tool or 90-degree pick (for wire harness retaining clips)

Phase 1: Removing the Factory Part

1. Disconnect the Battery: Always start by disconnecting the negative battery terminal in the trunk using a 10mm wrench to prevent electrical shorts and reset long-term fuel trims.
2. Remove the Cowl and Cabin Filter Assembly: On your 2011-2012 BMW 1 Series, use an 8mm socket to remove the six screws holding the upper cowl and microfilter. Release the side wire looms using a plastic trim pry tool and pull the cowl tray forward to create crucial clearance above the rear inlet pipe.
3. Disconnect Front Snorkel and Retaining Screws: Use a T20 Torx driver or flathead screwdriver to release the front factory intake duct clips that channel air from the front kidney grilles to the airbox.
4. Loosen Turbo Inlet Hose Clamps: Locate the dual turbo inlet connections at the rear and midsection of the factory airbox. Loosen both hose clamps thoroughly using a 6mm or 7mm nut driver.
5. Lift Factory Airbox Off Mounting Grommets: Pop the airbox assembly straight up from the rubber valve-cover grommets. Inspect the rubber isolators; if any remained stuck to the metal pins on the engine, retrieve them so they do not fall into the engine belly pan.

Phase 2: Installing the Air Intake Carbon Racing Filter

1. Prep and Transfer Sensors/Grommets: If your specific setup features an intake air temperature or vacuum reference port, carefully transfer the factory line or sensor using a T20 Torx driver or hand-pressure, ensuring the rubber O-ring is lubricated and seated without pinching.
2. Install Silicone Turbo Inlet Couplers: Slide the new silicone intake couplers onto the front and rear turbo inlet pipes. Hand-tighten the lower worm-gear hose clamps using a 6mm or 7mm nut driver so they remain adjustable while aligning the carbon housing.
3. Mount the Carbon Racing Filter Housing: Lower the carbon intake assembly into the 2011-2012 BMW 1 Series engine bay, sliding the outlets directly into the silicone couplers while pressing the base mounts securely into the factory rubber grommets. Check for adequate clearance against the vacuum canisters and brake line heat shielding.
4. Torque Clamps and Reassemble Cowl: Tighten all intake hose clamps firmly using your 6mm or 7mm nut driver (snug until the silicone compresses evenly; do not overtighten and crush the carbon fiber neck). Reinstall the OEM cowl tray and cabin filter using the factory screws and an 8mm socket.
5. Reconnect Battery and Perform Initial Calibration: Reconnect the negative battery terminal using a 10mm wrench. Start the vehicle and do not touch the gas pedal for at least 20 to 30 seconds. Allow the DME (engine computer) to calibrate idle air adaptations and settle the idle before test driving.

Disclaimer: This is a general guide provided for the 2011-2012 BMW 1 Series. Always refer to your factory service manual for exact torque specifications and safety procedures.