A variety of turbo kits are available for the B5 Audi S4, offering options for power levels ranging from around 400 horsepower to over 1000 horsepower, in both twin-turbo and single-turbo configurations. The best choice depends on your performance goals, budget, and desired drivability.
B5 s4 Turbo Kit Options
| Configuration | Power Potential | Characteristics |
|---|---|---|
| Twin-Turbo | 400-700+ HP | Excellent low-to-mid range power, quick spooling, better for street driving, more complex installation, potentially more expensive. |
| Single-Turbo | 500-1000+ HP | Higher maximum power potential, simpler and often more reliable setup (fewer components), may have more turbo lag at lower RPMs. |
Recommended Products For B5 s4 Turbo Kit
- 034Motorsport Stage 3 K04 Turbo Kit
- Power: Capable of an estimated 510 crank horsepower and 540 foot-pounds of torque on 91 octane fuel.
- Features: Uses genuine BorgWarner Audi RS4 K04 turbochargers and includes an 034Motorsport Stage 3 ECU upgrade, 550cc Bosch EV14 fuel injectors, and a complete hardware kit.
- Reviews: Praised for its complete “bolt-in installation” and retaining stock-like drivability, while providing significant power gains.
- JHM Audi K04 RS6-RS Turbo Kit
- Features: These turbos use a high-flow RS6-RS turbine side and a new high-flow lightweight, dual-stacked compressor wheel, providing quick low-to-mid range boost response.
- Reviews: Testers note crisp throttle response and power holding flatter throughout the power band compared to standard modified RS6 turbos.
- SSAutoChrome Audi B5 S4 2.7 Single Turbo Kit
- Features: This kit is designed to replace the stock twin-turbo setup with a single, more reliable turbo (PTE turbo flange) for increased power.
- Reviews: Advocates praise the “simplification” of the 2.7T engine bay, which aids maintenance and reliability for high-power builds. Note that this is a basic kit that requires supporting modifications and minor custom fitting.
Key Installation & Modification Requirements for a B5 s4 Turbo Kit
Installing a turbo kit requires significant supporting modifications to ensure reliability and performance.
- Engine Management/Tuning: Custom software tuning is essential to manage the increased boost, air, and fuel flow.
- Fuel System Upgrades: Higher flow fuel injectors (e.g., 550cc Bosch EV14) and potentially an upgraded fuel pump are needed.
- Intercooling and Exhaust: An upgraded intercooler system and a high-flow exhaust system (including a larger downpipe, often 3.5 inches for single turbo setups) are necessary for efficiency.
- Supporting Components: Consider upgrading spark plugs, ignition coils, diverter valves, and all vacuum lines to silicone. Ensure the engine is in good mechanical health before upgrading.
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