When converting from MAF to Alpha-N tuning on the S54, you must have a separate intake air temperature sensor (which is originally contained within the MAF or HFM of a stock S54.)
This kit allows you easily add such a sensor to the intake snorkel of a CSL-style carbon fiber airbox.
Includes E36 OBD1 sensor, factory pin terminals, connector, and rubber boot.
Alpha-N tune required, not compatible with stock tune or tunes that require use of the MAF.