APR TURBO KIT 2002-2005 A4 (B6) 1.8T Stage III+

55.00 LBS
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The Concept

The VAG 1.8T has quickly proven itself as one of the most technologically advanced power plants available. While the engineers who developed the kit made fantastic gains in both efficiency and reliability, they left much to be desired with regard to power. The Transverse Stage III Turbo System bridges this gap with uncompromising quality and extreme power. Stage III is the newest addition to APR's quality line of products.

While other companies use the term "R&D" loosely, we at APR feel that quality products start with quality planning. We begin with an idea and study the feasibility of the product. As designers we put a strong emphasis on safety and reliability. APR engineers developed the Stage III kit using Pro Engineer 2000i² 3-D CAD software. Prototypes are then processed using the 3-D Systems SLA machine. This rapid prototyping procedure allows for quick cast prototypes to ensure a perfect fitting final component. After the component has been verified correct, the final material cast can be run.

The Stage III utilizes one of the newest and most efficient turbos available. The Honeywell/Garrett turbos utilize the latest ball bearing design coupled with an integral wastegate and Inconel wheel. Make no mistake, these are not standard turbos retrofitted to ball bearing specs; they are the same type used in countless forms of motor racing such as the Audi R8 in the 24 Hours of Le Mans Series. APR is one of a few Garrett Engineering Houses in the US. We work closely with their engineers to design turbos that produce our desired performance level for each kit.

The APR Exhaust manifold is investment cast Inconel 625. Such material was chosen for its excellent thermal properties. Inconel can withstand temperatures of up to 2500 degrees Fahrenheit without structural degradation. The manifold runners are paired so that the exhaust pulses do not interfere with each other. This design maximizes low-end spool-up and boost-response. The manifold runners were also sized according to the power levels desired and with the size of the exhaust ports in mind. In order to prove the design, the drawing, as it existed in Pro-E, was run through a computational fluid dynamics program. This APR exhaust manifold is arguably the best 1.8T manifold available anywhere in the world due to its superior design and construction. No other company in North America has come close to reproducing a manifold at this level.

Other components quickly reached their operational limits and were also fabricated. The increased flow necessitated a larger MAF Housing. The diameter of the intake tubing was also increased to accommodate the increased airflow. A new larger air horn was placed on the MAF to further increase velocity. A flow straightener was then added to keep turbulence to a minimum. A flow straightener seems like a small detail and is easily over looked by most companies. However, this "small detail" is an integral component of this system allowing the larger MAF housing to be properly utilized. A new high volume fuel pump was added along with larger injectors to keep the fuel system within acceptable parameters.

APR engineers write their own proprietary data logging software and analysis programs. This tuning software, combined with APR's Dynapack chassis dynamometer, allows a degree of precision never before seen in the aftermarket industry. Our dyno tuning allows us to tune to any RPM at any load level. This equates into the smoothest, most powerful tuning available. Our software, as with our hardware, is equally ahead of the competition. It's a rare combination to find a tuning company that engineers both the software AND the hardware for their systems. The advantage of designing hardware that is built to utilize our specific software, is obvious. OUR hardware working with OUR software is what comprises a truly engineered "system" and not just a conglomeration of parts.

No other company has the switching capabilities or the programming capabilities that we have. From home programming to industry leading EMCS, our products set the bar in which all others are measured.

Power Figures

APR announces the Stage III+ kit, the ultimate turbo system upgrade for the 2002-2005 A4 1.8T. This kit is capable of 340 horsepower and 332 foot-pounds of torque at the flywheel on 93 octane gas, while retaining stock-like drivability. The highlights of the kit include the following:

  • APR Investment Cast Inconel Exhaust Manifold
  • Honeywell/Garrett Ballistic Series Ball-Bearing Turbocharger
  • Larger APR designed Mass Airflow Sensor Housing
  • APR Custom Cast Silicone Intake Hoses
  • APR High Flow Fuel Injectors and Fuel Pump
  • All Associate Plumbing and Hardware

Part of the APR Turbocharger System install process requires removal of the OEM Turbocharger. During this process, oil and coolant must be drained and should be replaced to offer superior performance and protection. The APR Turbocharger Systems are now complete turn key solutions, including everything you need down to the oil, coolant and oil filter. During checkout you'll be given the option between Motul Specific 502.00, 505.00 & 505.01 5W40 or Motul Power 300V engine oil as well as Motul Inugel Optimal Ultra Coolant and an OEM oil filter. The Premium Motul lubricant package is included at a much lower than retail price point and the costs are listed below.


Application Guide - Software Included
YearModelEngineDrivetrainTransmissionPart NumberPrice 
*Stage I/I+ and II/II+ customers receive all EMCS options with the purchase of Stage III+ at no additional charge. Please note that a full exhaust system (which is required) is not included with the kit and will need to be purchased separately.
2002 - 2005 A4 1.8T ALL Manual T3100010 $5,299.00  

The power increase with the APR Stage III+ kit for the A4 1.8T is substantial. It is highly recommended that brake and suspension upgrades are done to safely use the potential of this upgrade. It is also recommended that the stock engine internals be upgraded for power levels above 93 octane, as APR is not responsible for this type of damage to the engine

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