Alientech KESS3 Slave - Marine & PWC OBD Protocols upgrade from Slave to Master

A calibrated software update to your engine control unit that optimises fueling, boost, ignition and torque limits for better performance and/or economy.

Yes when done correctly and maintained properly. We work within safe limits for your specific engine, fuel and hardware condition.

Our Stage 1 calibrations keep reliability in mind. Aggressive driving or poor maintenance can affect longevity regardless of mapping.

Yes — we can return the ECU to factory software if required.

You should inform your insurer of any performance modification.

A remap alone does not fail an MOT. However, DPF/EGR/AdBlue deletes are for off-road/track use only and are not road-legal.

Gains vary by engine. See the performance stats on this page for your specific vehicle.

Typically 60–120 minutes for most vehicles, depending on ECU type and read/write method.

Stage 1 typically requires no supporting modifications. Stage 2+ may require intake, intercooler, exhaust or clutch upgrades.

Where supported, yes — for off-road or track use where appropriate.

Many turbo-diesels and some petrols see real-world MPG gains with sensible driving.

Use the booking system on this page — select your payment option and proceed to checkout.