B58 TURBO INLET - 240i 340i 440i F-SERIES GEN 1

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• 25% Larger Than OEM
• Increased Airflow
• 6-Layer Reinforced High-Temp Silicone

• CNC Machined Adapters


The ARM B58 Turbo Inlet improves airflow to the B58's turbo by increasing the diameter on the turbo inlet by a massive 25%.  Where the ARM B58 Turbo Inlet is greatly improved over the OEM inlets and many other aftermarket inlets is at the turbo snout connection.  The ARM B58 Inlet has an inside diameter of 2.5" at the connection to the turbo snout, compared to the OEM inlet which is only 2".  Also, by removing the sound mufflers, turbulent airflow is smoothed out, allowing it to enter the compressor turbine more uniformly.  The result is faster turbo spool, improved throttle response, and increased power and torque.  The ARM B58 Turbo Inlet comes complete with all of the hardware necessary to reconnect the OEM fittings.


The ARM B58 Turbo Inlet starts at the turbo with a CNC machined fitting which utilizes the OEM O-ring to seal, and C-clip to secure at the B58's turbo snout.  This is where the ARM B58 Inlet body connects to the turbo fitting.  The ARM B58 Inlet body is made of 6-layer reinforced high-temperature silicone, and it is constructed to allow for reinstallation of all the OEM fittings. 

The ARM B58 Inlet Body transitions to 3.75" ID where the included joining adapter can be used to connect either the OEM intake or the ARM B58 Intake which maintains a 3.75" diameter all the way to the air filter.


• ARM Turbo Inlet Body
• ARM Turbo Snout Adapter
• ARM Intake Adapter
• ARM PCV Adapter
• 5x Clamps


The ARM B58 Turbo Inlet is for Gen 1 B58 engines only found in the vehicles below. 

Make Model Submodel Engine
BMW F22 M240i B58 
BMW F22 M240i xDrive B58 
BMW F23 M240i B58 
BMW F23 M240i xDrive B58 
BMW F30 340i B58 
BMW F30 340i xDrive B58 
BMW F32 440i B58 
BMW F32 440i xDrive B58 
BMW F33 440i B58 
BMW F33 440i xDrive B58 
BMW F34 340i xDrive B58 
BMW F36 440i B58 
BMW F36 440i xDrive B58 


Every ARM Motorsports product is backed by a lifetime warranty which is automatically issued at the time of purchase. Your warranty protects you against any defects in craftsmanship or fitment. The warranty entitles you to a replacement unit.

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