RennTech R1 Performance Ecu Upgrade For Mercedes-Benz C209 CLK 550 - AutoTalent }
RennTech R1 Performance Exhaust Header For Mercedes-Benz CLK 550 - AutoTalent }
RennTech R1 Performance Exhaust Header For Mercedes-Benz c209 CLK 550 - AutoTalent }
RennTech R1 Performance SS Exhaust Header For Mercedes-Benz CLK 550 - AutoTalent }
RennTech R1 SS Exhaust Header For Mercedes-Benz CLK 550 - AutoTalent }
RennTech Exhaust Header For Mercedes-Benz CLK 550 - AutoTalent }
Description: The RennTech R1 Performance Package is the perfect entry level performance upgrade for the C209 CLK 550....
Vendor: RennTech
SKU: PKG.209.CLK550.PERF01
Product Type: Performance
Regular price
Regular price
Sale price
Subtotal: $5,290.00
10 customers are viewing this product
30 day returns
Learn More.
Free Shipping

Free standard shipping on orders over $99


The RennTech R1 Performance Package is the perfect entry level performance upgrade for the C209 CLK 550. The R1 performance package for the Mercedes 550 includes our proprietary ECU upgrade in addition to our stainless steel shorty headers designed specifically for the 550 V8 for a combination that provides increased performance, sound and throttle response across the vehicles entire powerband.

The R1 performance package increases performance to  413HP and 422 TQ at the crank, without sacrificing daily driver comfort or reliability and offer huge gains across the entire RPM range. Due to increased power and boost levels, 93 Octane or higher gasoline has to be used with R1 upgraded RennTech vehicles to avoid damage to the engine. States known for poor fuel quality have to be supplied with a lower power setup.


  • Long-lasting and driver reliability
  • Significant gains in horsepower
  • Increases the performance
  • Significant gains torque 
  • Increases horsepower
  • Increases throttle response
  • Increasing the engine's rev limiter
  • Incredible performance gains
  • RennTech ECU Upgrade
  • Stainless Steel Shorty Headers

      Stock Performance:

      • 382 HP / 391 LB-FT

      Modified Performance:

      • 413 HP / 422 LB-FT

      Vehicle Fitment:    

      • 2004 Mercedes-Benz C209 CLK 550
      • 2005 Mercedes-Benz C209 CLK 550
      • 2006 Mercedes-Benz C209 CLK 550
      • 2007 Mercedes-Benz C209 CLK 550
      • 2008 Mercedes-Benz C209 CLK 550
      • 2009 Mercedes-Benz C209 CLK 550
      • 2010 Mercedes-Benz C209 CLK 550


                                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.


                                  Others People Also Bought