2022-2026 Mercedes C300 Performance ECU Tune | W206
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See supported models, engine compatibility, and key specs in the description below.
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Installed the grills today couldn't be happier. Really improved the front end
J.W.
Both the grille and downpipes were great fitment and quality. Best bang for your buck. Service was great. Downpipes cannot go wrong for the price look and fit great. The car with the new downpipes sound amazing, truly opened up the already amazing sound of the car. Had it tuned and it drives and sounds amazing.
Cesar Cea
The CF Grills had perfect fotment and great quality. Was also very well packed for shipment.
Denis Alvarez.
Great product and very helpful staff! Cleans the look of the car.
Ronald Lorek Jr.
The wheels came out amazing. Was a little hesitant because of the lack of photos of different finishes and such, but the guys at GCA were super helpful and I got a rendering of the wheels before they started building them. I went eith the premium matte brushed 19x9.5+25. They were built to my exact spec for my S5. Not a bad deal at all for the price/quality, and you1re getting a wheel that pretty much no one else has. They also gave me the upgraded center caps at no cost which was a nice bonus.
Benjamin Troxell.
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- 1-Year Warranty
- 24/7 Customer Support
- 30 Day Returns
Description
*Please email us any special requests*
The W206 C300's 2.0L turbo four has more in it than Mercedes lets you use from the factory. The stock ECU calibration is conservative by design - tuned for the broadest possible range of fuel qualities, climates, and driving habits, which means there's real power left on the table for owners who want more from the hardware that's already sitting under the hood.
This W206 C300 performance ECU tune from GCA Performance unlocks that potential by recalibrating the ECU's boost targets, fueling maps, and ignition timing to extract what the engine is actually capable of delivering.
The difference isn't just a number on a dyno sheet. Throttle response becomes immediate instead of delayed, torque delivery is stronger and more consistent through the mid-range where you actually use it in daily driving, and the top-end pull carries harder instead of flattening out. It transforms the C300 from a comfortable commuter that happens to have a turbo into a car that genuinely rewards you for pressing the throttle.
GCA Performance securely saves your factory ECU data before flashing, so you can revert to stock settings at any time - whether it's for a dealer visit, a lease return, or just personal preference.
Built specifically for the 2022-2026 W206 Mercedes-Benz C300 with the 2.0L turbo four-cylinder engine.
We Stand Behind Our Products
- All items from us have a 1-Year Warranty!
Tuning Specs
- Fits: 2022 2023 2024 2025 2026 W206 Mercedes C300 2.0L I4 Turbo M254 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: 60 HP Increase
- Torque Gain: 60 TQ Increase
- The car's ECU comes locked from the factory, if you do NOT purchase the ECU unlock, you will need to arrange your own unlock before we are able to tune the ECU
Tuning Instructions
- Once purchased, we will email you over instructions
- ECU will need to be removed and mailed to us
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.
