MAF Kit E28 535i-P

SKU: MK E28 535i-P Category:

Product Description

The MAF Kit E28 535i-A consists of the MAF 3.0 sensor, PSC1-004, MAF harness and reducer.  The PSC1-004 calibrator comes with the R4 software and can be tuned with a Windows laptop.  Tuning with the PSC1-004 takes longer than tuning with the ARC2-A, but in the end is more precise.

Gains of around 12 hp and 12 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
  • PSC1-004 Air/Fuel Calibrator
  • MAF Wire Harness
  • Instructions

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

Additional Information

Weight 7 lbs
Dimensions 10.375 × 10.375 × 10.375 in

Click here to view the MAF Conversion Kit For E28 535i, E24 635i, E23 735i with PSC1 Installation Instructions.

Tech Notes

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

Click here to view the Getting Started with the R4 Software Tech Note.

Click here to view the Running the R4 Software on a USB Port Tech Note.

Click here to view the Piggyback Tuning Tech Note.


Click here to view the MAF Kit E28_535i-P Wiring.

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