The XtremeX is one of Link’s premium ECUs with more inputs, outputs and features.

The XtremeX has built in E-throttle and all the advanced features including Anti-lag, Cruise Control and Traction Control.

With 8 Peak and Hold Injector drives and 8 ignition drives the XtremeX can control up to 4 rotors or 8 cylinders with sequential injection and direct spark. The XtremeX is a great choice for professional level motorsport or more demanding road car applications.

Please note: for peak & hold please contact a Link ECU Sales Person to purchase a G4+ Xtreme ECU.
Requires "A" & "B" Looms for installation.

If it is Onboard Digital Wideband Lambda Control you are after, consider the 

So what are the main changes compared to the G4+ range? 

Developed by Link’s in-house Laboratory of Speed, the new G4X ECU product range boasts numerous upgrades over its predecessor, already a world leader in its class. Headed by a generous increase in Power and Logging capabilities, the improvements within G4X will satisfy even the most demanding users.

The power has come courtesy of a new, more powerful microcontroller and a vastly upgraded communications chip, which allows for download speeds of up to 16 times faster than the G4+ platform. With G4X, your engine will run smoother, accelerate faster and act more responsively. Another of the most considerable advancements of the new G4X ECU comes via the heavily expanded Internal Data Logging which is over 100 times the size of prior versions. All this means the new G4X ECU can log more data, more accurately and be downloaded faster, so you can get back to the exhilaration of unleashing your engine. 

G4X has 512 megabytes of logging at 32bit using up to 250 channels, each limited to up to 1kHz per channel (by the Operating System), with a maximum of 100kHz.

The inputs and outputs have also been enhanced with the frequency range expanded and unified across all the pins, meaning the new ECUs can send and receive even more complex data at a much faster rate. 

Link’s uncompromising engineering team didn’t stop there, however! Additional advancements come via the smart use of Single Precision Floating Point Formats, Maths Blocks, Asynchronous Injection and reduced Jitter, allowing for greater accuracy in everything the ECU controls including smoother fueling and faster spark timing.

It also features 8 x faster communications speed, allowing you to download logs 8 x faster and pushes all the logging quickly up to a new and improved PCLink – available for download here

Advanced features not found on the Storm:

Fully programmable E-throttle control complete with capability of gear shift throttle blip and antilag.

Cruise control.

Two independent CAN modules.

30 general purpose tables (up from 20)

All Motorsport features including full gear shift control, cruise control, traction control, antilag and launch control.

Advanced closed loop lambda strategy and dual bank lambda control.

The Link G4X XtremeX is optimised for the Speed Density Principle which requires installation of an Intake Air temperature sensor (IAT) and use of the inbuilt Manifold Absolute Pressure Sensor (MAP). The factory air flow meter is no longer required and this potentially restrictive component can be removed. 

Link A and Link B Looms (or the Link A Connector Kit, Link B Connector Kit) are required for installation and can be supplied separately. Also required is a quality Intake air temperature sensor and for turbo charged applications we recommend the use of a Boost Control Solenoid for best boost control. 

The Link G4X XtremeX comes with an engine unspecific pre loaded Base Map. Initial Set Up to suit your engine and installed components is however required after succesful installation. This can be done via PCLink which is a FREE software application. We highly recommend set up and tuning to be completed by an experienced tuner to ensure best results. 

A correctly selected, installed and configured Link ECU can completely control your engine package. The most important part of complete control is having complete tunability of the ECU, in order to achieve an optimal tune for your engine. When tuned by a professional, benefits can include:

  • Increased power and torque output
  • An engine that drives smoothly
  • Basic engine safety features, to reduce the chance of engine damage
  • Ability to add Motorsport and advanced safety features 
  • Data logging 

PBMS has developed a system to ensure quality, repeatable results with every tune whilst taking utmost care of your pride and joy. You can find out more about the PBMS 9-Step Tuning Process here

If you require help with installation of this Standalone ECU, accessories or need a complete custom wiring harness there is more information available here and we are more than happy to help. We can build anything from basic custom looms for your road car to high end Motorsport quality harnesses. 

The full Link Engine Management product range can be found in chart below, providing a quick overview of the different features and capabilities of each Link ECU. If you are unsure or have additional questions to help you choose the correct ECU for your application please don't hesitate to contact us today!


The Link G4X XtremeX is fully Flex Fuel capable to allow use of multiple fuel types for example Ethanol (E85) or Race Gas as well as regular 98 Octane fuel. An additional Flex Fuel Sensor is required to make use of this function. A custom Flex Fuel Tune using various percentage fuel mixtures (of your choosen fuels) is also necessary to achieve best performance and reliability. A wide range of popular add ons and accessories are also available in our store. 

What comes in the box? 

  • Link G4X XtremeX ECU
  • Link Tuning Cable
  • Mounting Bracket
  • Link Manual
  • Link ECU Sticker

Please note that the ECU has to be unlocked for initial set up for security and warranty purposes. 

All Link ECUs (Engine Control Units) are 100% New Zealand designed and developed. Buy with confidence from one of New Zealands most iconic businesses with over 30 years experience in Motorsport and choose Possum Bourne Motorsport!




Dimensions: 185mm(L) x 130mm(W) x 40mm(H) (without looms)

Mass: 680grams

SKU 109-4000
Brand Link ECU
Shipping Weight 0.5000kg
Shipping Width 0.300m
Shipping Height 0.100m
Shipping Length 0.200m
Shipping Cubic 0.006000000m3

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