2015-2022 Mercedes-Benz C400/C450/C43 AMG Performance ECU Tune | W205

*Please email us any special requests*

This W205 C43 AMG performance ECU tune recalibrates your car to unlock what the M276 is actually capable of delivering, and the result isn't just more horsepower on a dyno sheet - it's a car that feels fundamentally different to drive.

Mercedes built these cars to be careful, with conservative boost targets, soft fueling maps, and timing calibrations that leave significant headroom the hardware can safely handle. 

Once you install a tune, throttle response goes from Mercedes-smooth to immediate, mid-range torque hits harder coming out of corners and highway on-ramps, and the top-end pull carries further instead of tapering off the way the factory tune allows. 

The twin-turbo V6 already has the hardware to make serious power - the factory ECU is just the leash holding it back. For owners who've already added downpipes and an intake, the tune is where all of those bolt-ons finally come together and deliver the combined gains they were always capable of.

GCA Performance securely saves your factory ECU data before flashing, so you can revert to stock settings at any time.

We Stand Behind Our Products

• All items from us have a 1-Year Warranty! 

Tuning Specs

• Fits: 2015 2016 2017 2018 2019 2020 2021 2022 W205 Mercedes C400 C450 C43 AMG 3.0L V6 Twin Turbo M276 Engine
• 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 (GCA Performance Downpipes) Tuning available (*We will clarify which Stage you need in the tuning instructions after purchase. We do not charge extra for Stage 2 tuning*)

Tuning Gains

• Horsepower Gain: 100 HP Increase
• Torque Gain: 100 TQ Increase
• For model years 2019-2023, the car comes with a Torque & Horsepower Limiter from the factory. We recommend purchasing a CPC module to maximize gains. Without the CPC Module you are still able to achieve gains of 60 HP and 60 TQ)

Tuning Instructions

• Once purchased, we will email you over instructions
• The car is able to be tuned via a cable, which we will provide to you

Shipping

• FREE SHIPPING to the lower 48 States!
• 5-8 Days total turn around time
• We ship all of our items through UPS or FedEx

We always recommend Professional Installation. 

DISCLAIMER: Removing, disabling, or altering emissions equipment on a pollution-controlled road vehicle is illegal. Installing devices or software that trick, disable, or modify emissions controls and monitors on a pollution-controlled road vehicle is also illegal. This product is sold only for racing, competition, track, hobby, or other off-road use. Its use is prohibited in any motor vehicle that is subject to emissions inspection or control. Installation and usage of after-market parts and software may impact drivability, reliability, emissions, insurance coverage and factory warranty. Legal in California only for racing vehicles that may never be used, or registered or licensed for use, upon a highway. All installation-risk and use-risk is borne by the end-user and installer of these parts.

German Car Accessories shipping & returns

• Shipping: orders typically ship within 1-2 business days; any lead time is stated on the product page.
• Returns: within 30 days of delivery, unused, in the same condition and original packaging with all contents. Installed parts and special-order items cannot be returned. Returns are handled case by case (arrived damaged, wrong item ordered, etc.).
• Shipping costs are non-refundable. Customers pay import duties and taxes on international orders.

To start a return or ask a question, contact us with your order number.