SKU: 53049887501 | UPC: 4063984022013
BorgWarner Turbocharger SX K04 Audi/VW 1.8L 5V TFSI Upgrade 2002-2009
BorgWarner SX K04 turbocharger delivers direct bolt-on performance upgrade for Audi A4 A4 Quattro TT and VW Passat 1.8T 20V TFSI engines. Replaces stock K03 unit with quicker spool-up and higher boost levels for noticeable power increase. Maintains OEM fitment and drivability with enhanced airflow up to 350 HP potential.
Key Features
- Ball Bearing CHRA: Reduces friction for spool under 2500 RPM and extended bearing life under high boost
- Billet Compressor Wheel: 46/52mm inducer/exducer design flows 45+ lbs/min for mid-range torque gains
- Larger Turbine Wheel: 48/51mm Inconel wheel improves exhaust flow and response over stock
- Direct Bolt-On Design: Matches OEM mounting points compressor and turbine housings for seamless install
- Investment Cast Housings: Durable Ni-Resist turbine housing withstands 1000+ degrees sustained EGT
Product Notes
- Tuning required to realize full power and prevent lean conditions
- Inspect oil feed and return lines during install for optimal lubrication
- Special order item typically ships within 3-5 business days
Installation Notes
- Professional installation recommended.
- ECU remap essential for safe boost levels above 20 PSI
- Bolts directly to stock exhaust manifold and downpipe
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2005 | Audi | A4 | 1.8T |
| 2002-2005 | Audi | A4 Quattro | 1.8T |
| 2001-2006 | Audi | TT | 1.8T |
| 2001-2006 | Audi | TT Quattro | 1.8T |
| 2006-2009 | Audi | A3 Quattro | 1.8T |
| 2003-2005 | Volkswagen | Passat | 1.8T |
| 2005-2008 | Audi | A4 | 1.8T |
Why Choose BorgWarner?
- OEM supplier to VW and Audi for millions of production turbos
- Proven reliability in high-volume applications worldwide
- Precision balanced assembly for quiet operation and longevity
Frequently Asked Questions
-
Q: Will this fit my 2004 Audi A4 1.8T with ATW engine code?
A: Yes direct replacement for ATW AWL BAM and similar 20V 1.8T codes in A4 B6 models -
Q: What materials are used in construction?
A: Billet aluminum compressor 360-degree Ni-Resist turbine housing Inconel turbine wheel ball bearings throughout -
Q: What warranty applies and install tips?
A: 1-year manufacturer warranty covers defects must use 5W-40 synthetic oil professional dyno tune advised post-install
Shipping & Handling
- Method: Standard Ground
- Availability: Special order ships in 3-5 business days
- Packaging: Foam protected box 20 x 18 x 18 inches
- Weight: 25 lbs
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