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BorgWarner Turbocharger SX K04 Audi/VW 1.8L 5V TFSI Upgrade - Black Ops Auto Works
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BorgWarner Turbocharger SX K04 Audi/VW 1.8L 5V TFSI Upgrade

BorgWarner
BWA53049887501
4063984022013
Turbochargers
1 Units In Stock - Ships Next Business Day
$ 3,090.77 $ 1,951.53
$ 1,951.53

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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