In the 1980s, an iconic legend was born as the world fell in love with Audi's 5-cylinder engine's unmistakable and intoxicating growl. To the Audi enthusiast, the light-weight, compact 5-cylinder engine represented the hallmark of Audi's technical prowess and ability to emotionally captivate an audience with a driving experience unlike any other in its time. Audi's announcement of the return of its 5-cylinder roots via the 2.5 TFSI sent shockwaves across the community and resonated deeply within the hearts and minds of APR's staff. With this creation, Audi spoke directly to every enthusiast and gave APR the unique opportunity to write into Audi's 5-cylinder history books with modern day engineering expertise.

APR's technical reach has grown enormously since opening in the 1990s and currently represents a force of unmatched performance without compromise within the performance enhancement sector for Audi vehicles. The APR Stage III 2.5 TFSI Turbocharger System is a culmination of roughly two years worth of engineering research, development and motorsport testing unheard of in the market today. With brutal testing on multiple continents, including wins in the prestigious German Tuner GP at the Hockenheim ring, the APR Stage III Turbocharger System is the pinnacle of Audi's German engineering enhanced by APR's American ingenuity.

The APR Stage III Turbocharger System is a turnkey solution designed to expand on the TT RS's already stellar performance by increasing peak horsepower to roughly double that of the European model. Sitting at 665 horsepower and over 560 ft-lbs of torque on high octane fuel, the vehicle's performance is transformed to that of a modern day equivalent of Audi's motorsport 5-cylinder engines of yesteryear. APR's advanced knowledge of engine management combined with an uncompromising selection of premium materials, access to the latest engineering equipment and techniques, as well as a highly educated and capable staff of engineers, resulted in a turbocharger system capable of delivering a truly exhilarating and fulfilling driving experience.

Turbocharger:

At the heart of the APR Stage III GTX Turbocharger System is a GTX3576R turbocharger, utilizing the latest technologies from Le Mans winning turbo manufacturer, Garrett Honeywell. The turbo features a fully-machined, eleven-blade billet compressor wheel and a dual ball bearing oil and water-cooled CHRA. APR's Engineers spent countless hours testing several turbocharger units to arrive at a configuration suitable for their power, reliability and drivability requirements. Testing began with smaller internally gated units and gradually increased over time until a balance was met within all categories. The result is a system that spools quickly with excellent response, even in the lower RPM range, while producing top end power figures beyond that of a Audi R8 LMS Ultra V10 FSI!

Each turbocharger unit is assembled and clocked in-house at APR with the necessary components to ensure proper fitment and orientation for compressor inlet and outlet systems as well as all oil and coolant lines.

APR High Pressure Fuel Pump

The APR HPFP expands the 2.5 TFSI's direct injection fueling capabilities to the levels required for proper operation with the APR Stage III Turbocharger System. The pump is offered in two forms. A entirely new pump can be purchased, or the vehicle's existing pump can be sent to APR for a rebuild.

APR Exhaust Midpipe

The APR Midpipe Exhaust System connects the included exhaust downturn and downpipe to the factory catback exhaust system or APR RSC Catback Exhaust System. This part is only necessary if the vehicle is not currently equipped with an APR Downpipe Exhaust System or APR RSC Turboback Exhaust System.

APR Intercooler System

The APR Intercooler System is a necessary upgrade for the system to run safely and to meet the advertised power levels. The factory intercooler shows signs of weakness on a completely stock 2.5 TFSI and as such is not capable of supporting the APR Stage III Turbocharger System's power levels.

Acceleration Testing

Due to our dealer agreement, APR products cannot be shipped outside of the United States.