MAF Kit E30 325i-A

SKU: MK E30 325i-A Category:

Product Description

The MAF Kit E30 325i-A consists of the MAF 3.0 sensor, ARC2-A, MAF harness and reducer.  The ARC2-A calibrator is great for users who do not want to tune with a laptop.  It can be adjusted in real time and a complete tune can usually be completed in about 15 minutes.

Gains of around 10 hp and 10 ft-lbs of torque are typical with this kit.  You will feel the benefit with quicker throttle response, smoother acceleration and a more free-reving top end.

The main benefit of the MAF conversion comes from the wide open cross section of the MAF sensor.  This removes a major restriction from the intake resulting in less pressure drop, better cylinder fill and more power.

A second benefit of running the MAF conversion is the ability to retune the engine for other mods.  The MAF kits come with a calibrator that is used to match the curve of the MAF sensor to the curve of the original air flow meter.  The calibrator is also capable of fine tuning the fuel curve to compensate for things like a cold air intake, cams, headers and a free flowing exhaust.

This kit no longer includes the ARM1 air/fuel meter.


  • MAF 3.5 Sensor
  • ARC2-A Air/Fuel Calibrator
  • MAF Wire Harness
  • 3.5” to 3.0” Reducer/coupler/clamps
  • Instructions

Legal only for racing vehicles which may never be used upon a highway.

Additional Information

Weight 7 lbs
Dimensions 10.375 x 10.375 x 10.375 in

Click here to view the MAF Conversion Kit for E30 325i Installation Instructions.

Tech Notes

Click here to view the AFM to MAF Conversion Tech Note.


Click here to view the MAF Kit E30 325i-A Wiring.

Project Cars

Click here to view the BMW E30 325i with MAF Kit Project Car.

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