LEIB OPF Deleter for BMW G29 Z4 M40i B58TU - Plug & Play GPF/OPF Delete Emulator, No Tune, No CEL (2019+) PN 1259212198

LEIB Z4 M40i G29 B58TU GPF Bypass Module

Unlock the soundtrack and flow you want from your BMW Z4 M40i without touching the factory calibration. The LEIB GPF bypass module is a smart, clip-in electronics solution that lets you run a particulate filter-free exhaust on the B58TU-powered G29 while keeping the engine management light off and drivability stock-smooth. No coding, no remap, no wire cutting. Just proven hardware that works.

Part number: 1259212198

Why enthusiasts choose this LEIB module

• Run a GPF-free exhaust set-up without ECU recalibration or dealer coding
• No warning lights on the dashboard and no fault entries according to LEIB
• Installs under the bonnet with OEM-style connectors and a tidy, reversible fit
• Typically a one hour job with basic tools, no soldering required
• Designed to be undetectable by standard dealer diagnostic equipment according to LEIB
• Automotive-grade loom and connectors for long-term reliability

What it does

The LEIB module emulates the particulate filter pressure signal on the G29 Z4 M40i, allowing the mechanical removal of the petrol particulate filter while your DME remains on factory software. In plain terms, it is a pressure sensor simulator that enables a freer-flowing exhaust and more engaging sound without triggering an engine management light or limp mode. Ideal for anyone searching for a GPF bypass box, OPF removal electronics, particulate filter emulator, or CEL-free GPF solution for the B58TU.

Fitment

• BMW Z4 G29 M40i, 2019 onwards, B58TU engine

Our experience

We have fitted and used this LEIB unit on multiple Z4 M40i builds. Installation is straightforward, the module is neat in the engine bay, and customers consistently report quiet dashboards, OEM-like behaviour and a noticeable improvement in exhaust character once the particulate canister is removed. It simply does what it promises.

Installation and fitting

Quick-fit, plug-in installation with clear online instructions. No cutting or splicing. For a professional install, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Pre-dispatch compatibility check

We verify fitment before shipping. Add your UK registration number or the last 7 digits of your VIN at checkout and we will confirm suitability for your Z4 M40i.

Important notes

• No error entries and no dashboard lights when used as directed, based on LEIB information
• Described by LEIB as not detectable by standard BMW diagnostic testers
• Any pressure sensor shown in illustrative images is not included with this module
• Intended for off-road, track or export use where regulations permit. Check local laws before purchase

Brand

LEIB

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