Euro HFM/Mass Air Sensor, Bosch - E36 M3 (OBD1)

Critical part for fuel, timing, and all-around engine performance. Upgrade for OBD1 S50 and S52

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This part is listed by BMW as BMW part number 13621403123 (13 62 1 403 123) and is described as the larger 3.5" HFM from the 1993-1995 Euro E36 M3. It's a direct plug-in for US models with OBD1 wiring and proper software. Bosch part #0280217806.

This larger HFM (MAF) is commonly used for tuning and increasing intake flow on US S50 and S52 engines, including engine swaps. It has a 3.5" diameter, as opposed to the stock US HFM (MAF) which has a 3.0" diameter. The larger HFM also has a greater resolution for reading airflow, which means fuel and timing corrections can be more precise.

Required: larger 3.5" air filter/intake, 3.5" throttle body boot, OBD1 wiring harness and ECU, appropriate software tune, and most applications require higher flow fuel injectors.

This is an OEM HFM manufactured by Bosch - the original supplier to BMW for this part, as well as many other components. As the OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.

BMW Fitments:

3 Series
E36 (92-99) > M3 (1995)
E36 (92-99) > M3 (96-99)
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 M - S52
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