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Ignitions and Electrical› Ignition Components

Weistec

M139 WMI Kit

Name: M139 WMI Kit
Brand: Weistec
SKU: 01-139-02376-2

$1,600.00

SKU: 01-139-02376-2

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Weistec M139 WMI Kit is a water-methanol injection system for the M139 engine. The kit provides estimated power gains of 20-80 HP and 0 TQ.

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The Weistec M139 Water-Methanol Injection (WMI) System is engineered to enhance the performance and reliability of the Mercedes-Benz M139 engine. By lowering these temperatures, the system also increases knock and detonation resistance, allowing the engine to operate more consistently and safely, particularly during performance driving or in demanding conditions. This WMI kit helps to improve the overall consistency of the M139 engine. While the exact horsepower and torque gains can vary, this system is estimated to provide an increase of 20-80 HP at the engine. The advertised gains are calculated estimates based on engine performance metrics.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Weistec
Part Number	01-139-02376-2
Category	Ignitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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