BorgWarner K04-025 / K04-026 Audi 2.7T RS4 Upgrade

Code: 53049880025/26


In Stock
Included Warranty

12 Months
All CTS Turbo products are warrantied against manufacturing defects for a period of 12 months from the date of invoice. Warranty does not cover abuse, misuse, consequential damages, normal wear and tear, improper installation, or damages resulting from racing. Warranties only apply to the original owner. If a product is found defective the customer will receive, at the discretion of CTS Turbo, free repair or replacement. Warranty on other manufacturers will be processed under their terms.


Audi fanatics, this is the heart of the RS4 turbo upgrade for your B5 S4/Allroad/A6 2.7T. These RS4-K04’s are a factory bolt on for the B5 S4/Allroad/A6 2.7T, they will bolt up to your downpipes/catalytic converters, and exhaust manifolds. K04-specific turbo inlet pipes are required.

*RS4 turbochargers have the ability to produce too much boost & air volume for your stock fuel system & programming. This is not a complete turbo upgrade kit*

*2003 and 2004 Audi A6 and Allroad 2.7T’s with automatic transmissions have a different downpipe design, and some modification is required for installation.*



*CTS TURBO’s Official Policy regarding Borg Warner KKK Turbocharger Warranty Claims*

To be eligible for warranty consideration, Borg Warner has stipulated that KKK turbochargers (or turbocharger kits) must be installed by a professional repair facility.

  • Warranty claims must be accompanied by a receipt from a professional repair facility showing the date and vehicle mileage when the turbocharger was originally installed.

  • An additional receipt from a professional repair facility must accompany the warranty claim indicating:

                1. Date and mileage at which the turbocharger failed

                2. Reasons for turbocharger failure

                3. Proposed repairs intended to correct the cause of the failure (if any).

Borg Warner will, at its discretion and with proper documentation, replace a turbocharger that has failed due to defects in materials and/or original workmanship. All associated labor charges for diagnosis and repair are the responsibility of the vehicle owner.



Additional information

Weight 30 lbs
Dimensions 18 × 15 × 13 in



Make Model Year Generation
Make Model Year Generation
AUDI A6 1998 - 2004 C5
AUDI A6 ALLROAD 1998 - 2004 C5
AUDI S4 2002 - 2005 B5