XS-POWER K04-015 XLB Billet Turbo Upgrade – Audi A4 A6 VW Passat 1.8T
RS6-Based CHRA • 46.4/62.3mm XLB Billet Compressor • RS6 Turbine/Shaft • VSR Balanced • 295+ WHP Capable
XS-POWER K04-015 XLB – NOT A STANDARD K04-015 TURBO
Take your longitudinal Audi or Volkswagen 1.8T build beyond the limitations of a conventional K03 or standard K04-015 with the XS-POWER K04-015 XLB upgraded billet turbocharger.
The K04-015 XLB was developed as a serious stock-location Audi VW 1.8T turbo upgrade using heavily modified K04-015-style housings combined with substantially upgraded internal components.
At the center of the XLB package is a massive 46.4mm / 62.3mm forged billet compressor wheel, an RS6-based upgraded CHRA, and an RS6 turbine wheel and shaft assembly.
The result is an extremely compact performance turbo package designed for longitudinal 1.8T applications while offering significantly greater performance potential than the original factory K03 and standard K04-015 configurations.
With the correct ECU calibration, fueling and supporting modifications, the XS-POWER K04-015 XLB is capable of supporting approximately 295+ WHP.
K04-015 XLB Performance Highlights
- XS-POWER K04-015 XLB upgraded turbocharger
- Designed for longitudinal Audi / Volkswagen 1.8T engines
- Major performance upgrade from factory K03 turbocharger
- Larger performance configuration than a conventional K04-015
- 46.4mm / 62.3mm XLB forged billet compressor wheel
- RS6-based upgraded CHRA center section
- RS6 turbine wheel and shaft assembly
- Highly modified compressor and turbine housings
- K04-015-style longitudinal 1.8T flange configuration
- High-speed VSR balanced
- Component-level balanced
- Brand-new performance turbocharger
- Approximately 295+ WHP capable with proper setup
- Excellent stock-location turbo solution for performance street builds
⚙️ Technical Specifications
| Turbo Model | XS-POWER K04-015 XLB |
| Engine Platform | Audi / Volkswagen Longitudinal 1.8T |
| Compressor Wheel | XLB Forged Billet 46.4mm / 62.3mm |
| CHRA | RS6-Based Upgraded CHRA |
| Turbine | RS6 Turbine Wheel & Shaft Assembly |
| Flange Configuration | K04-015 Style – Longitudinal 1.8T |
| Balancing | High-Speed VSR + Component-Level Balanced |
| Power Capability | Approx. 295+ WHP With Proper Supporting Modifications & Tune |
| Condition | Brand New |
Audi & Volkswagen 1.8T Applications
Designed for longitudinal Audi / Volkswagen 1.8T applications using K04-015-style turbo fitment, including commonly encountered:
- Audi A4 1.8T
- Audi A6 1.8T
- Volkswagen Passat 1.8T
- Audi B5 A4 1.8T
- Audi B6 A4 1.8T
- Audi C5 A6 1.8T
- VW B5 Passat 1.8T
- VW B5.5 Passat 1.8T
FITMENT NOTE: This turbo is intended for longitudinal 1.8T applications using the appropriate K04-015-style configuration. Verify engine configuration, turbo flange, oil/coolant connections, intake, exhaust/downpipe and tuning requirements before ordering.
Why Upgrade From the Factory K03?
The original K03 is well suited to factory power levels, but performance enthusiasts quickly reach its practical airflow limitations when increasing boost and engine output.
The XS-POWER K04-015 XLB provides a much more serious performance foundation by combining a substantially larger billet compressor with RS6-based rotating components inside a compact K04-015-style package.
This makes the XLB particularly attractive for enthusiasts searching for an:
- Audi A4 1.8T turbo upgrade
- Audi B5 A4 K04 turbo upgrade
- Audi B6 A4 1.8T upgraded turbo
- VW Passat 1.8T turbo upgrade
- K03 to K04 turbo conversion
- K04-015 upgraded turbocharger
- K04-015 billet turbo
- 1.8T stock-location big turbo
- Longitudinal 1.8T performance turbo
- RS6 CHRA 1.8T turbo upgrade
XLB 46.4/62.3mm Billet Compressor
One of the defining components of this turbocharger is the XLB 46.4mm / 62.3mm forged billet compressor wheel. The oversized compressor configuration provides the airflow potential required for substantially greater engine output than a conventional factory-sized turbocharger.
Combined with the upgraded RS6-based CHRA and RS6 turbine/shaft assembly, the XLB provides a serious performance configuration while retaining the compact architecture required by longitudinal Audi/VW 1.8T installations.
⚡ RS6-Based CHRA & Turbine Assembly
Unlike an ordinary replacement K04-015, the XLB uses an RS6-based upgraded CHRA together with an RS6 turbine wheel and shaft assembly.
These upgraded components are integrated into highly modified housings configured around K04-015-style longitudinal 1.8T fitment.
325+ WHP Performance Potential
With the proper supporting modifications and ECU calibration, this turbocharger is capable of supporting approximately 295+ wheel horsepower.
Actual output will vary according to engine condition, boost pressure, fuel quality, ECU calibration, intercooling, exhaust system, fueling and other supporting modifications.
Supporting Modifications & Installation
A proper ECU tune is required. Depending on your vehicle and target power level, supporting upgrades may include:
- Performance ECU software / custom tuning
- Upgraded fueling
- High-flow intercooler
- Performance intake system
- High-flow exhaust / downpipe
- Upgraded diverter valve
- Boost-control upgrades
- Upgraded clutch where required
Professional installation is strongly recommended. This is a performance turbocharger intended for modified vehicles and should not be treated as a basic factory-equivalent replacement turbo.
Package Includes
- 1 × XS-POWER K04-015 XLB Upgraded Turbocharger
- RS6-Based CHRA Assembly
- K04-015-Style Modified Turbo Housings
XS-POWER PERFORMANCE
K04-015 XLB • 46.4/62.3 Billet Compressor • RS6 CHRA • RS6 Turbine • VSR Balanced
Built for Boost • Built for Power • Built to Perform
Search Terms & Performance Applications
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- XS-POWER
- UPGRADED
TURBOCHARGER AUDI A4 PASSAT 1.8T UPGRADE
UPGRADED KO4-015XLB Audi A4/A6/Passat 1.8T
Upgrade for 1.8T from the K03 and LARGER than k04-015
#XLB
XLB 46.4/62.3 BILLET COMPRESSOR WHEEL
RS6 TURBINE AND SHAFT!
NO ONE ELSE LIKE THIS ON THE PLANET WITH THIS PRICE, WARRANTY OR PRODUCT. NO ONE!
Has an RS6 CHRA and highly modified housings with k04-015 flanges for audi 1.8T longitude engines.
This is 295+WHP capable!
!You will need a tune!
No shaft play
#KO4-015 XLB
High Speed VSR balanced and component level balanced!
KO4-015XLB
XLB IS THE BEST B5 A4 TURBO OUT THERE!
