Untd. Performance Intercooler Kit – Audi RS6 C5 4.2 Bi-Turbo

Bring modern cooling performance to a legendary platform with the Untd. Performance Intercooler Kit for the Audi RS6 C5 4.2 Bi-Turbo. Designed to address the factory system’s heat-soak limitations, this high-efficiency intercooler upgrade delivers significantly lower intake temperatures, improved turbo response, and more consistent power delivery—essential for tuned or track-driven RS6 builds pushing past OEM limits.

Key Features:

Massively Improved Cooling Efficiency
Engineered with a high-density bar-and-plate core and increased surface area, the Untd. Performance intercoolers provide superior heat dissipation compared to stock. This results in dramatically reduced intake air temperatures, allowing for more aggressive tuning and better protection against detonation under sustained boost.

Direct Fitment for the C5 RS6 4.2TT
Designed as a bolt-on upgrade, this intercooler kit retains compatibility with factory mounting points, charge piping, and shrouding. Installation is straightforward and does not require extensive modifications—ideal for performance upgrades that maintain OEM+ functionality.

Minimized Pressure Drop, Maximized Flow
Optimized end tank geometry and smooth internal flow paths reduce turbulence and maintain charge pressure across the core, ensuring your turbos can work more efficiently. The result: faster spool, stronger midrange torque, and improved high-RPM pull.

Durable, Motorsport-Proven Construction
Constructed from TIG-welded aluminum and pressure-tested to handle high-boost applications, this kit is built to endure the heat and demands of aggressive driving. Whether you’re pushing a Stage 1 tune or a full custom build, this intercooler is ready to perform.

Ideal for Tuned and Big Turbo Setups
Whether you’re running stock K03s or upgraded turbos, the Untd. Performance Intercooler Kit is essential for maximizing the performance of your RS6 while maintaining engine reliability—even in demanding conditions.

Compatibility:

• Audi RS6 C5 (2003–2004)

• Engine: 4.2L Bi-Turbo V8 (BCY engine code)

• Fits both U.S. and European spec models

Maximize power, preserve reliability, and bring your RS6’s performance into the modern era with the Untd. Performance Intercooler Kit—purpose-built for one of Audi’s most iconic super sedans.

⚠️ Note: For optimal results, this intercooler kit is recommended for use with supporting upgrades (tune, exhaust, etc.). Not compatible with Allroad or A6 variants without modification.