WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The APR K04-15 Turbo System (T2100004) is the definitive "OEM+" performance solution for the B6 Audi A4 1.8T. Designed as a direct drop-in replacement for the factory K03 turbocharger, this kit utilizes a genuine K04 unit to significantly increase top-end horsepower and mid-range torque without the complexity or lag of a larger "big turbo" build. With just an upgraded exhaust, this system has been dyno-proven to produce 247 HP and 286 lb-ft of torque on 93 octane fuel.
This kit is engineered to be a straightforward hardware swap and includes the necessary gaskets and studs for a leak-free installation. Crucially, the system includes APR’s recalibrated ECU software, which is specifically mapped to optimize the K04’s efficiency on the 1.8T longitudinal platform. Please note that while software is included, high-flow injectors are required to reach the rated power levels and must be purchased separately if you do not already have them.
Features:
- Significant Power Upgrade: Delivers a substantial increase in both horsepower and torque over the factory K03 setup.
- OEM Fit & Finish: Uses a genuine K04 drop-in turbocharger that retains factory oil and coolant line locations for an easy installation.
- Comprehensive Hardware: Includes essential gaskets, O-rings, and studs to ensure a proper, professional seal.
- Included Software: Comes with the specific APR ECU recalibration required to manage the increased airflow and fueling demands.
- Proven Reliability: Maintains OEM-like drivability and engine longevity while providing a much more aggressive power band.
Product Contains:
- (1) K04-15 Turbocharger Unit
- (1) Compressor Inlet O-ring
- (3) Turbo Outlet Studs
- (1) Exhaust Manifold to Turbo Gasket
- (1) Turbo to Catalytic Converter Gasket
- (1) APR ECU Software Authorization
Technical Specifications:
| Specification | Details |
|---|---|
| Turbocharger Type | Genuine OEM K04 (Drop-in) |
| Estimated Power | 247 HP / 286 lb-ft (with exhaust) |
| Required Fueling | Bosch 02801558921 / Audi 06A906031J |
| Software Status | Included (Requires Dealer Install) |
Critical Tech Note: This kit requires specific high-flow fuel injectors (Bosch #02801558921). While the ECU software is included in the purchase price, it must be installed by an Authorized APR Dealer.
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