The Best BMW MAF Conversion Kit Available

Price: $399.00
Bosch ECU # (Last 3 digits) Tooltip

Desired RPM Limit




  • Increased HP and Torque
  • Increased engine response
  • 3" Housing decreases restrictions
  • No internal moving parts
  • Factory like design and control
  • Weight savings

Miller MAF Frequently Asked Questions

Miller Performance is the only company to bring an affordable mass air flow conversion to the market with a long standing, proven track record. Not only is it affordable, it is the ONLY plug and play MAF conversion that has no hassles and needs no end user adjustment. It is all taken care of on the chip provided with our conversion. Over the past 12 years, the Miller MAF has built a solid reputation for being one of the best bolt on performance products you can use on your early model BMW car. With an unheard of price, and supreme signal quality there is no other choice that can come close to competing with our system.

Whenever you change the air metering device on your engine, you MUST recalibrate the tune. Because each model of sensor has its own unique air flow curve, the ECU needs to be reprogrammed to use and understand the signal properly. Our MAF software is unrivaled. Not only does our software take care of the intricate details associated with recalibrating the code for a new sensor type, we also optimize all other parameters to yield the best performance. With years of software development behind us, we have FLAWLESS tunes for your BMW. With software available for stock applications to high horsepower turbo applications, we have the solution for you that will blow your mind with its pristine drivability.

E30 M20 recomendation:
We highly recommend including a fresh, new rubber intake boot with the installation of your MAF sensor. We recommend this for the M20 engines because the stock intake diameter is only 2.7" in diameter. If your intake boot is old, chances are it is pretty dry and you won't be able to avoid the boot tearing when you install the MAF. We have new intake boots available. With a little heat from boiling the boot in water, the fresh rubber becomes soft enough to easily stretch over the 3" MAF housing without issues. For old and dry boots, boiling doesn't always work since they are typically quite brittle. We have both intake boot options since M20's have two possible styles. Type 1 and Type 2 are shown below and are available for purchase here.
M20 intake boot type 1

Still don't know what you need? Here is a general application guide.

Recent Reviews

  • Just wanted to say a big thank you to everyone at Miller Performance. Purchased the Gen 3 maf conversion and have...

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    Andrew Ewing
    Bangor - Northern Ireland

  • Great Product and the guys at Miller Performance were great helping me out with some hiccups on the install. have had about 15,000kms on...
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    James Adams
    Newcastle - Australia

  • WOWW!! Amazing difference in throttle response and full throttle performance.The increase in mileage from 16 to 18 was a nice extra.I'm...
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    howard gill
    carlton - United States

  • 1990 535i manual. Prompt service and good parcel tracking to Canadian Maritimes. Product installed easily in about 30 min. There is a...
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    Chris McFarlane
    Fredericton - Canada

  • Got the car running - which it does superbly now. Excellent product. Thanks for suppprting these old BMWs! Cheers, Landon
    Landon Holt
    White Salmon - USA