Miller GEN III/M MAF - M Cars

GENIII/M the ULTIMATE MAF conversion Kit

Price: $449.00
Bosch ECU # (Last 3 digits) Tooltip

Intake Boot

Intake boot color



  • Increased HP and Torque
  • Increased engine response
  • 4" 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. With years behind the product now, 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 M3, M5 or M6 car. We never stop trying to better ourselves. With an unbeatable 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. 


The M3 MAF is a nice upgrade for your peppy 4 cylinder. It offers a PEAK gain of 16 true HP at the wheels and a PEAK gain of 12 ft lbs at the wheels! Even more exciting is the large torque gain under the peak number, an impressive 17 ft lbs at 3400 RPM! Dyno sheets posted below.


M3 4" Intake Elbow (OPTIONAL):


If your are increasing the diameter of your air metering device, why not increase the entire intake track? For the M3, the GEN III/M MAF kit can come with an optional 4” intake elbow. This increases the entire intake track to 4” opposed to the factory 3” tube allowing you to move more volume of air for additional top end power. Another benefit is less turbulence; the 4” silicone elbow is smooth compared to the factory 3” corrugated elbow.

M5 & M6

The M5 and M6 MAF’s had a few bugs during the Gen II life span. While most people didn't have any issues, there were a select few that had drivability problems. We are always learning and Miller Performance and striving to better our products and service. With GEN III we have taken our knowledge and improved the drivability of our MAF conversions for all cars. The Gen III/M MAF is by far the best conversion out there for your M5 or M6. With our improved design, the GEN III/M offers unprecedented drivability as well as better performance than any of our previous MAF conversions.


M5 & M6 Intake Boot (OPTIONAL):

The stock intake plenum has a smaller diameter entry than the MAF. Standard silicone reducers are to short to replace the stock boot causing headaches and ugly messes of hose clamps. Instead of trying to mate two hoses together, we have custom length reducers made that will replace your stock intake boot entirely. These boots not only offer the right length, but are much smoother and offer improved airflow compared to the accordion style factory boot. Remember, this isn't necessary, but it will make your install much cleaner looking and easier to finish.