Description
Designed for the Audi RS6 and RS7 C8 equipped with the 4.0 TFSI EA825 twin-turbocharged V8, the Untd. Performance Intercooler with Billet End Caps is engineered to improve charge-air cooling, reduce heat soak, and support consistent power delivery under demanding driving conditions.
Featuring a high-performance two-row aluminum intercooler core with 45 rolled tubes, 3 mm tube height, and 4.85 mm multi-louvered fins, this upgrade is designed to maximize heat transfer while maintaining efficient airflow through the cooling system. The rolled tubes incorporate internal fins to promote heat dissipation from the compressed intake air, helping manage elevated temperatures generated by the twin turbochargers.
The intercooler also features CNC-machined billet aluminum end caps and TIG-welded construction, providing a robust assembly designed to withstand the elevated boost pressures and thermal demands associated with high-performance EA825 applications.
By improving charge-air temperature management, the Untd. Performance Intercooler helps reduce heat-related performance loss and supports consistent operation during repeated acceleration, spirited driving, and ECU-tuned applications.
Key Features
- High-Performance Two-Row Core:
Features a two-row aluminum intercooler core designed for efficient charge-air cooling. The 45-tube configuration provides increased tube count and a layout optimized for heat transfer compared with the factory 22-tube design. - 3 mm Rolled Tubes with Internal Fins:
The 3 mm rolled-tube design incorporates internal fins that promote heat dissipation from compressed intake air. This configuration helps manage charge-air temperatures under sustained boost and demanding driving conditions. - 4.85 mm Multi-Louvered Cooling Fins:
The 4.85 mm multi-louvered fins are designed to improve heat exchange across the core while maintaining an effective balance between cooling performance and airflow resistance. - CNC-Machined Billet Aluminum End Caps:
Precision-machined billet aluminum end caps provide a robust end-tank assembly designed for high-boost applications. Their construction offers a refined performance appearance while supporting reliable charge-air containment. - TIG-Welded Construction:
TIG-welded joints provide a durable connection between the core and end tanks, eliminating reliance on the factory-style crimped plastic end-tank and gasket arrangement. - Reduced Heat Soak:
Designed to help maintain lower intake air temperatures during repeated acceleration, high ambient temperatures, and sustained high-load driving. Better thermal management helps reduce heat-related power loss and supports more consistent performance. - Supports ECU-Tuned Applications:
Suitable for vehicles running Stage 1, Stage 2, and other performance calibrations. Improved charge-air cooling can help maintain more consistent operating temperatures as boost pressure and engine output increase. - OEM-Style Connections:
Designed around factory-style inlet and outlet connections for integration with compatible OEM components. Confirm exact fitment and included installation components before purchase. - Direct-Fit Application:
Engineered for compatible Audi C8 RS6 and RS7 4.0 TFSI EA825 configurations, subject to verification of the vehicle’s model year and existing cooling-system configuration.
Core Specifications
| Specification | Details |
|---|---|
| Core Type | Two-row performance intercooler |
| Core Material | Aluminum 6061 |
| Tube Configuration | 45 rolled tubes |
| Factory Tube Count (Reference) | 22 tubes |
| Rolled Tube Height | 3 mm |
| Multi-Louvered Fin Height | 4.85 mm |
| Internal Tube Design | Rolled tubes with internal fins |
| End Caps | CNC-machined billet aluminum |
| Core-to-End-Cap Construction | TIG-welded |
| Vehicle Platform | Audi C8 RS6 / RS7 |
| Engine | 4.0 TFSI EA825 twin-turbo V8 |
| Installation | Vehicle-specific replacement; verify fitment |
Estimated Performance Benefits
An upgraded intercooler primarily improves charge-air temperature management and performance consistency rather than generating a fixed horsepower increase on its own. Actual results depend on ambient temperature, existing heat soak, ECU calibration, fuel quality, boost pressure, and supporting modifications.
The following figures are reference dyno results reported for this core design by its original performance-system manufacturer, not independently verified results for the Untd. Performance product.
| Tuning Configuration | Reported HP Gain | Reported Torque Gain |
|---|---|---|
| Stage 1 / Stock-Turbo Configuration | ~+20 WHP | ~+18 WTQ |
| Stage 2 / Performance-Tuned Configuration | ~+40 WHP | ~+39 WTQ |
Stock Tune: The primary benefit is improved thermal stability and reduced heat-related performance loss during repeated acceleration. Peak power gains may be limited when the factory ECU is not requesting additional output.
Stage 1 Tune: Improved charge-air cooling can help maintain more consistent intake temperatures and ignition timing under sustained load, supporting repeatable performance.
Stage 2 / Higher-Output Setup: Vehicles running higher boost pressure or more aggressive ECU calibrations can benefit from improved thermal management, helping reduce the likelihood of heat-related power loss.
The figures above are reference results from testing conducted by VF Engineering and reported by the original intercooler-system manufacturer. They should not be interpreted as guaranteed gains for every vehicle or as verified dyno results for this specific Untd. Performance product.
Why Upgrade?
The factory intercoolers on the Audi C8 RS6 and RS7 must manage substantial heat generated by the twin turbochargers. During repeated acceleration or sustained high-load driving, charge-air temperatures can rise, prompting the ECU to reduce ignition timing and potentially limit power output.
The Untd. Performance Intercooler with Billet End Caps is designed to improve heat dissipation through its two-row core, 45 rolled tubes, internal tube fins, and 4.85 mm multi-louvered cooling fins. Its billet aluminum end caps and TIG-welded construction provide a robust solution for demanding performance applications.
The result is improved charge-air temperature management, reduced susceptibility to heat soak, and more consistent power delivery during spirited street driving and high-performance use.
For enthusiasts pursuing increased power through ECU tuning or supporting modifications, upgraded intercooling provides an important foundation for maintaining thermal stability and repeatable performance.
Compatibility
- Audi RS6 C8 – 4.0 TFSI EA825 twin-turbo V8
- Audi RS7 C8 – 4.0 TFSI EA825 twin-turbo V8
OEM intercooler reference part numbers:
- Left: 4K0 145 805 P
- Right: 4K0 145 806 B
Important Notice
- Verify the exact vehicle application, installation requirements, and included hardware before purchase.
- Performance figures are reference estimates and are not guaranteed. Actual results vary according to ECU calibration, ambient temperature, fuel quality, boost pressure, vehicle condition, and supporting modifications.
- The reported dyno gains are reference results from third-party testing and are not verified results for this specific product.
- Professional installation is recommended.
- Any ECU calibration changes should be performed by a qualified tuner familiar with the Audi EA825 platform.
