3-Inch MAF Conversion Kit

This system aims to deliver increased horsepower and torque, improved engine response, and reduced restrictions with its 3-inch housing. Unlike other solutions, it boasts no internal moving parts, contributing to a factory-like design and control, while also offering weight savings. Miller Performance highlights this as the "Best BMW MAF Conversion Kit Available," emphasizing its affordability and proven track record. The kit is designed as a "plug and play" solution, meaning no end-user adjustments are typically required as the necessary tune is handled by the included chip. The company states that over 12 years, the Miller MAF has established a reputation as a top bolt-on performance product for early BMWs, offering supreme signal quality. Crucially, changing the air metering device necessitates ECU recalibration to interpret the new sensor's unique air flow curve. Miller Performance provides proprietary MAF software that not only handles these intricate recalibrations but also optimizes other parameters for peak performance. They claim to offer flawless tunes for stock to high horsepower turbo applications, ensuring pristine drivability. For M20 engines, Miller Performance strongly recommends replacing the intake boot due to its tendency to be brittle and prone to tearing when installing the larger 3-inch MAF housing. They offer new intake boots compatible with M20 engines, noting that some heat applied to a fresh boot can help it stretch over the housing without issue.