EuroPrismCo

2012-2015 Mercedes GL450/GL550 Performance ECU Tune | W166

$999.99 Tax included. Shipping calculated at checkout.

4.9 (240+ reviews)

Quantity

Fitment guaranteed
Professional installation available
Worldwide shipping

2012-2015 Mercedes GL450/GL550 Performance ECU Tune | W166: Unlock Your Vehicle's True Potential

Experience a transformative driving experience with EPC Performance's expertly engineered ECU tune, designed to optimize your vehicle's performance, power, and responsiveness. With this upgrade, you'll enjoy immediate throttle input, stronger and more consistent torque delivery, and a sharper powerband that pushes your car harder, longer, and more efficiently.

What You Get:

Fits 2012-2015 Mercedes GL450/GL550 4.7L Twin Turbo V8 M278 Engine (W166 X166)
Downpipe readiness with check engine light suppression (for off-road use only)
Enhanced exhaust acoustics with extended or adjustable burble
Factory speed governor removal for unrestricted performance
Octane-specific calibration tailored to your fuel quality
Cold start behavior fully configurable (On/Off)
100% Reversible, always able to go back to stock at any time
Stage 1 (Factory Downpipes) & Stage 2 (EPC Performance Downpipes) Tuning available

Experience a 60 HP increase and 60 TQ increase with this performance ECU tune, designed to deliver exceptional driving dynamics and unparalleled performance.

Shipping & returns

Ships in 3–5 business days. 30-day returns on unfitted parts. Tracking provided on every order.

Fitment & installation

Test-fitted in-house for a precise, OEM+ fit. Professional installation available — contact us to book.