XS-POWER K04-001XL E05 billet turbocharger upgrade with huge 50mm billet compressor wheel for Audi TT and Volkswagen 1.8T applications featuring fast spool hybrid K04 performance

BILLET K04-001 mk4 VW Turbo 1.8T EO5 50mm COMPRESSOR JETTA GOLF GTi KO4-001 2yr - Turbos - Volkswagen-1

$459.00 - $500.00
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KO4-001 XLB SUPER LARGE
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 XS-POWER K04-001XLB
BILLET TURBO UPGRADE 

Huge 50mm Billet Compressor • Audi TT / VW 1.8T • Fast Spool K04 Hybrid Power

Do Not Get Stuck With A Weak K03 Replacement When You Can Step Into Real K04-001XL Power

This is the XS-POWER K04-001XL upgraded E05 billet turbocharger — built for customers who want much more than a basic K03 replacement or small-frame stock-style turbo.

WE HAVE THE BEST AND THE LARGEST FOR THE CHEAPEST. WORD.

This upgraded model features a huge 50mm billet compressor wheel designed to move serious air while still keeping excellent spool response on the Audi / Volkswagen 1.8T platform.

Think of this as a hard-hitting K04 hybrid that moves into GT28RS-style territory, but in a smaller, faster-spooling package for the 1.8T crowd.

Do not get fooled by blade count alone. Compressor size, wheel design, turbine match, fitment, tune, fuel, altitude, and supporting mods all matter. This turbo was built for real-world spool and strong power potential.

⚙️ TURBO FEATURES

  • Upgraded K04-001XL / E05 style turbocharger
  • Huge 50mm billet compressor upgrade
  • Fast-spooling K04 hybrid response
  • Designed for strong street power and quick boost response
  • GT28RS-style performance territory in a compact turbo layout
  • Great upgrade over weak K03 replacement units
  • Includes turbocharger and gaskets
  • No inlet pipe included
  • Exhaust side photos should be checked before ordering to confirm fitment

COMMON FITMENT

Designed for select Audi / Volkswagen 1.8T applications using compatible K03 / K04-001 style fitment.

  • 2000-2001 Audi TT 180HP FWD with ATC engine
  • 2000-2006 Audi TT Mk1 Typ 8N 1.8T 180HP applications
  • 1998-2004 Volkswagen Beetle 1.8T
  • 2000-2005 Volkswagen Golf Mk4 GTI / GLS 1.8T
  • 2000-2005 Volkswagen Jetta Mk4 GL / GLI / GLS 1.8T
  • 2000 Volkswagen Golf 1.8T
  • 2000 Volkswagen Jetta 1.8T

Important: Does NOT fit Audi TT 225HP models without required supporting changes. Always verify your turbo, inlet, exhaust housing, and engine code before ordering.

ENGINE CODE REFERENCE

  • 2000 Golf / Jetta: AWD
  • 2001 Golf / Jetta: AWW
  • 2002+ Golf / Jetta: AWP
  • 1997-1999 Passat: AEB / AWP references must be verified
  • 1999-2001 Passat: ATW
  • 2002 Audi A4: AMB
  • 2000-2001 Audi TT 180HP: ATC / AJQ / APX / APP / ARY / AUQ
  • 2001-2004 Audi TT 180HP: AWP

Some applications may require a larger turbo inlet pipe or supporting hardware. For example, if you have a 2000+ Audi TT Coupe FWD 180HP with ATC engine, you may need the larger inlet pipe. Please verify before ordering.

PACKAGE INCLUDES

  • 1x XS-POWER K04-001XL E05 billet turbocharger
  • Turbo gaskets

No inlet pipe included.

REAL-WORLD DYNO DISCUSSION

There are customer dyno graphs showing this turbo making strong real-world power, including one graph showing approximately 355 WHP.

A second set of graphs compares this turbo against known competitor setups after a retune.

Customer feedback has shown strong spool characteristics with minimal lag compared to larger hybrid units.

One customer dyno result was reportedly performed at approximately 8600 feet above sea level on 89 octane fuel, which is a very harsh testing environment.

At sea level with better 91 octane fuel and proper tuning, power potential may be significantly higher depending on setup.

Power results vary based on tune, fuel quality, elevation, intercooler, exhaust, engine health, boost level, and supporting modifications.

WHY UPGRADE TO THE K04-001XLB?

A standard K03 replacement can leave you with less performance than expected. The XS-POWER K04-001XL is built for customers who want a much stronger turbo upgrade while still keeping responsive spool and street-friendly behavior.

Perfect for:

  • VW 1.8T street builds
  • Audi TT 180HP upgrades
  • Fast spool turbo setups
  • K03 replacement upgrades
  • K04 hybrid performance builds
  • Customers wanting more airflow without going full big-turbo

⚠️ IMPORTANT FITMENT NOTES

  • Verify exhaust housing photos before ordering.
  • Verify engine code before ordering.
  • Some applications may require upgraded or larger inlet piping.
  • Professional installation and custom tuning are recommended.
  • Supporting fuel, intercooler, intake, and exhaust upgrades may be required for best results.
  • Does not include inlet pipe.

 XS-POWER PERFORMANCE LINKS

Explore more XS-POWER and SSAutoChrome performance turbo products:

  • EO5 50mm BILLET COMPRESSOR
    KO4-OO1XL Upgraded Model - HUGE Compressor -
    THIS TURBO IS gt28RS territory...slightly smaller.
    EXHAUST SIDE PICS TO MAKE SURE IT WILL FIT
    AWW ENGINE CODE,
    Turbo, with gaskets, no inlet -
    Don't get stuck with a KO3 replacement that is less power then your OEM model
    Don't get fooled by the Blades - check our blade count out - true EO5 spooling power
    FOR example , if you have a 2000 + Audi TT coupe, fwd 180 HP with ATC Engine -you will need to get the larger INLET pipe. Please contact us for further help and details.
    2000 - 2001 Audi TT - NON-Quattro with ATC engine1998 - 2004 Volkswagen Beetle - 1.8T2000 Volkswagen Golf - 1.8T2000 Volkswagen Jetta - 1.8T
    00-04 Audi Mk400-05 Volkswagen Golf Mk4 GTI/ GLS00-05 Volkswagen Jetta Mk4 GL/ GLI/ GLS00-06 Audi TT Mk1 Typ 8N (Does Not Fit with TT 225 PS)99-05 Volkswagen Beetle 1.8T
    There are 2 posted sets of graphs:
    1 shows this turbo at 266whp
    The second set of graphs show it against some known competitors after a retune.
    In the last picture shown you will see e dyno.graphs. These are posted on my facebook pages as well along with a full review from a customer from Columbia. This dyno shows stock vs frankenturbo f21 vs my billet k04-001. The first graph also shows that my turbo has no lag just like the stock k03 and does not lag like the frank unit.
    This is real numbers done by a customer at 8600ft above sea level on 89 octane gas...the only available gas in his country.
    At sea level and 91 octane we expect a 25% increase just based on atmospheric pressures and fuel. This potentially means 320+whp!!!!
    2000 Golf/Jetta: AWD awd,
    2001 Golf/Jetta: AWW aww,
    2002+ Golf/Jetta: AWP 1997-1999 Passat: AEB and awp
    1999-2001 Passat: ATW
    2002 A4: AMB 2000-2001 TT 180hp: ATC,AJQ,APX,APP,ARY,AUQ
    2001-2004 TT 180hp: AWP

     

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