MAFSync

Aftermarket airflow meter translator device. Pre-tuned and shipped for your specific engine selection. Converts your AFM signal to run a modern mass airflow sensor — clean idle, stable fueling, no ECU modification required.

First Batch Production Run — 4–6 Week Lead Time. This is the first production run of MAFSync. Orders placed now will ship approximately 4–6 weeks after the batch order closes, plus transit time. Off-road and competition use only. Not responsible for engine damage or mechanical issues arising from installation or use. See full terms before ordering.

MAFSync Kit

First Batch — Pre-Order Open
Step 1 — Select Your Engine
● 4-Cylinder — 7-Pin Round Connector
✓
M42B18
1.8L DOHC 4-cyl
Motronic 1.3
E30 318is · E36 318i/is
7-pin round
✓
M40B18
1.8L SOHC 4-cyl
Motronic 1.3
E30 318i
7-pin round
✓
M43B18
1.8L SOHC 4-cyl
Motronic 1.3
E36 318i
7-pin round
● 6-Cylinder — 5-Pin Rectangular Connector
✓
M20B25
2.5L SOHC 6-cyl
Motronic 1.3
E30 325i · E28 525e
5-pin rect.
✓
M20B27
2.7L ETA 6-cyl
Motronic 1.1
E28 528e · E30 325e
5-pin rect.
✓
M20B20
2.0L SOHC 6-cyl
Motronic 1.0
E30 320i · E21 320
5-pin rect.
Optional Add-On
Airbox Adapter
Adapter to mount the 70mm MAF housing to your factory airbox inlet
+$20
MAFSync Kit Includes: MAF sensor · Engine harness · Pre-flashed module $379
Total—
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Select your engine above to continue
Secure checkout via Stripe
In Production

80mm MAFSync Kit

Designed for bigger engines like the M30B35 3.5L Big Block. Uses the larger 80mm housing for maximum airflow.

Need Something Custom?

Running an unusual connector, non-standard chassis, or want a specific harness configuration? Custom kits are available. Message the shop below.

Message the Shop

Supported Engines

BMW M20B25/B27 — Inline-6 (70mm Kit)

The M20 is BMW's workhorse late 80s engine. Replacing the restrictive vane AFM with a modern MAF signal sharpens throttle response and stabilizes idle.

E30 325i/eE28 525i/eMotronic 1.0/1.1/1.3

BMW M40, M42 & M43 — Inline-4 (70mm Kit)

Covering BMW's 4-cylinder range. The original proven platform for MAFSync, utilizing the 7-pin round connector harness.

E30 318isE36 318i/isMotronic 1.3/1.7

How It Works

The Problem

Mechanical vane-type meters (AFM) are restrictive and prone to wear. Modern hot-wire MAF sensors are faster and more accurate, but output a signal the factory ECU doesn't understand.

The Solution

MAFSync acts as a digital bridge, translating the modern MAF signal into the exact voltage curve your factory ECU expects. No ECU modifications required.

ECU Compatibility

ConfirmedBosch Motronic 1.0, 1.1, 1.3, 1.7
Signal TypeVane AFM analog to digital MAF
PlatformCustom firmware / Onboard IAT

About This Product

MAFSync started as a solution to a single problem on a single car — a discontinued M42 AFM with no clean replacement. The fix worked. The firmware was refined. The same core approach now covers the entire M20 and 4-cylinder lineups, with the M30 and S38 in active development.

Follow the build on Instagram @Revive.Ur.Ride

Shipping

MAFSync ships worldwide from Ontario, Canada. We partner with a specialized cross-border courier to inject packages directly into local postal networks (like USPS and PostNL). Because of this, US customers will not pay any duties or surprise customs fees. All orders include full end-to-end tracking. As this is a first batch production run, please allow 4–6 weeks from batch order close to shipment, plus transit time. You will receive a shipping notification with tracking the moment your unit is on its way.

United States$15 USD · Fully Tracked
Canada$12 USD · Fully Tracked
International$22 USD · Fully Tracked (Global Partner Network)
Batch Lead TimeShips 4–6 weeks from order close date
International buyers: Import duties and taxes. We are working on a cost effective solution for our customers overseas.