2015-2023 Mercedes-Benz C200/C250/C300 Performance ECU Tune | W205
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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
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Description
*Please email us any special requests*
The 2.0L turbo four in the W205 C300 is a solid engine that Mercedes deliberately held back with conservative software. The factory ECU is calibrated for the widest possible range of conditions - different fuel grades, different climates, different drivers - which means the boost targets, fueling maps, and timing are all set well below what the hardware can safely deliver.
This W205 C300 performance ECU tune from GCA Performance recalibrates those maps to close the gap, and the difference transforms the C300 from a comfortable commuter into a car that actually feels quick.
The change is the most noticeable in the mid-range where you spend most of your time driving. Highway merges, on-ramp pulls, and two-lane passing situations all feel completely different - the turbo builds boost faster, the torque delivery is stronger and more immediate, and the car stops feeling like it's thinking about your throttle input before responding. For owners who've already added an intake and downpipe, the tune is where those bolt-ons finally wake up and deliver the combined gains they were always meant to provide.
GCA Performance securely saves your factory ECU data before flashing, so you can revert to stock settings at any time for dealer visits, lease returns, or personal preference.
Fits all 2015-2023 W205 Mercedes-Benz C200, C250, and C300 models across both pre-LCI and facelift years.
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 2023 W205 Mercedes C200 C250 C300 2.0L I4 Turbo M274 M264 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: 70 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 40 HP and 40 TQ)
- For car's with build dates after June 2020 (6/2020+) 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
- 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.
