RennTech Performance Ecu Upgrade For Mercedes-Benz W205 C43 AMG - AutoTalent }
RennTech Performance Ecu Upgrade For Mercedes-Benz W205 C43 AMG - AutoTalent }
RennTech Ecu Upgrade For Mercedes-Benz W205 C43 AMG - AutoTalent }
RennTech Performance Ecu tuning For Mercedes-Benz W205 C43 AMG - AutoTalent }
RennTech Performance Engine Upgrade For Mercedes-Benz W205 C43 AMG - AutoTalent }
RennTech Ecu Upgrade For Mercedes-Benz C43 AMG - AutoTalent }
Description: RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU...
Vendor: RennTech
SKU: 54.205W.C43BI
Product Type: Performance
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Subtotal: $1,980.00
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RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal. RennTech proprietary tuning module stores both the RennTech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be reflashed at any time as many times as you wish.

RennTech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s! Our experience, countless hours of in-house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

RennTech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RennTech performance software unleashes the true potential of your Mercedes.

With the RennTech ECU Upgrade the W205 - C 43 AMG Sedan gains up to +25 HP and +42 LB-FT, based on power numbers measured by RennTech. Please note that the Mercedes M276 engine performance when measured obtains higher numbers than rated from factory. The maximum power number reached with the RennTech ECU Upgrade for the W205 - C 43 AMG Sedan is 400 HP and 440 LB-FT.


Mercedes M276 engine performance when measured, obtains higher numbers than rated from factory

Power gains are calculated with stock numbers measured by RENNtech

Crank Performance Numbers are calculated with a 17% Drivetrain loss on 4MATIC vehicles

Our numbers will be dependent on conditions and fuel quality. 91+ Octane gasoline is mandatory with this Performance Package


  • Gains up to +25 HP and +42 LB-FT
  • Long-lasting and driver reliability
  • Significant gains in horsepower
  • Increases the performance
  • Significant gains torque 
  • Increasing the engine's rev limiter
  • Incredible performance gains

Stock Performance:

  • 362 HP @ 5,500-6,000 RPM; 384 LB-FT @ 2,000-4,200 RPM
  • 375 HP @ 5,600 RPM; 398 LB-FT @ 3,300-3,600 RPM

    Modified Performance:

    • 400 HP @ 5,450 RPM; 440 LB-FT @ 3,250-3,600 RPM

     Vehicle Fitment:    

    • 2015 Mercedes-Benz W205 C43 AMG Sedan 
    • 2016 Mercedes-Benz W205 C43 AMG Sedan 
    • 2017 Mercedes-Benz W205 C43 AMG Sedan 
    • 2018 Mercedes-Benz W205 C43 AMG Sedan 
    • 2019 Mercedes-Benz W205 C43 AMG Sedan 


                              Images are for representation purpose only and may differ depending on application.

                                If you have any fitment questions, please feel free to reach out to our team via the contact methods below. If you are contacting us for any order status updates, please give us a call, or email us. We are a lean operation bringing you the best shopping experience possible. We are working on your orders as quickly as we can. We thank you for your patience.

                                Please reach out to us at (310) 231-0292 for sales inquiries if you are in the United States, Canada, Mexico.
                                For more in-depth product questions, fitment questions, product inquiries please email our performance specialists at
                                All other inquiries:
                                Please direct your inquiries to the chat functionality on our website.

                                Returns Policy

                                If a product is ordered and not wanted, the UNUSED item can be returned for a 25% restocking fee unless otherwise specified. In some cases, we may offer the ability to return the item to us for a lesser restocking fee and then keep the balance as a store credit. To return an item, it must be in brand new condition with original packaging.

                                We cannot accept a return on special ordered or custom items.

                                Shipping is non refundable in either direction unless approved by AutoTalent. All items wanting to be return MUST be reported within 30 days of the original invoice date. No items will be returnable after 30 days. All products shipped from the AutoTalent facility are shipped via FedEx, USPS, or USPS. Some packages shipped from the manufacturer may or may not require signatures for package release.

                                Special Order Items

                                Some items may be special order specifically for the customer’s vehicle. These items generally require a deposit or paid in full. Once this deposit amount is notified to the customer and they agree to order the special order item, the deposit becomes non-refundable. These special order items cannot be returned or resold. Cancellations are not allowed on special order parts.

                                AutoTalent DOES NOT REFUND SHIPPING CHARGES. If you modify, install, or alter the item in any form, we cannot accept it as a return. We will not cover any expenses related to the product or installation, and you may be required to purchase a replacement.

                                ** All cancellations that are requested that are NOT due to items not being in stock or delayed by the manufacturer are subject to a 5% processing fee. When you place an order with us we pay credit card fees that are NOT returned back to us. We will absorb these fees if we do not have the item in stock OR if you agree to the original ETA and that ETA is NOT met. If you decide to cancel for any other reason you will not receive this 5% fee back


                                We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

                                When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

                                Please also note that the shipping rates for many items we sell are weight-based.

                                Learn more about our Price match policy

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