APR Tuning Products for the Audi B5 - A4

APR's Snub Mount Upgrade replaces the front engine mount on the car. This mount enhances upshifting and downshifting, reduces driveline shock, and helps power transfer by taking up excess drivetrain slack.

APR's A4 Exhaust is a stainless steel, 2.5" mandrel bent, cat-back exhaust. On an A4, the catalytic converter is bolted to the turbocharger and then the exhaust begins with the downpipe. Unlike most other aftermarket exhausts, the APR exhaust includes a downpipe. This exhaust is very quiet and simply changes the tone of the exhaust to a deep, unobtrusive sound. With TIG welding, fully stainless construction, and CNC'ed hangers, you will not find a higher quality system on the market.

APR is in the process of forming a complete line of exhaust upgrades for your A4. Whether for street or track use we will have the right application for you!

APR is please to present our front mounted intercooler for the A4 1.8T. The construction and advanced design techniques used in the APR intercooler sets ours apart from all the others on the market. Utilizing such technologies as a top-bottom feed core, custom mandrel bent plumbing, and innovative cast endtanks with internal vaning, our intercooler has produced excellent results in testing.

The conditions of one test that was performed is as follows: at 20 psi of pressure with a vehicle speed of 70 mph, and an elevation of approximately 500 feet above sea level. Under these conditions the internal flow was measured at 720cfm. Also at those conditions, with an input temp of 240 degrees F, the intercooler was quite effective; cooling the output air to 126 degrees F. While doing this, the intercooler measured a pressure drop of only .58 psi.

Equally as impressive with the APR intercooler was the external pressure drop (the amount of air pressure behind the intercooler) of only 1.01 psi. This helps to allow airflow to other critical parts of the car such as the radiator and A/C condenser. While the internal pressure drop is important, the external pressure drop is often overlooked. Most other intercoolers commonly cause 1.5 to 2.0 pounds of pressure drop, hindering the radiator from effectively doing its job of cooling the engine.

The highlights of the APR Intercooler kits include the following:

* APR Cast End Tanks with Internal Vaning
* Top-Bottom Feed Bar and Plate Aluminum Core
* Mandrel-Bent, Powdercoated Stainless Steel Plumbing
* APR Custom Silicone Intake Hoses
* All Associated Brackets and Hardware

APR Stage III is our cutting-edge turbo upgrade for your A4 1.8T. We at APR have worked long and hard to bring you the finest 1.8T upgrade available. Both kits are made with the best materials and engineering available, from the exhaust manifold to the hose clamps. APR Stage III is offered in a 280hp version with a 340hp Stage III+ version available. Our Stage III kit consists of the following components:

* APR Investment Cast Inconel Exhaust Manifold
* Garrett/Allied Signal Ballistic Series Ball-Bearing Turbocharger
* APR High Flow Catalytic Converter
* APR Custom Cast Urethane and Silicone Intake Hoses
* APR High Flow Fuel Injectors
* All Associate Plumbing and Hardware

The most important part of the Stage III kit is the exhaust manifold. APR has spent enormous time and resources developing the turbo manifold. The exhaust manifold has been designed in Pro/Engineer 20, a 3-D modeling package and validated extensively on the computer using Exa Powerflow, a CFD analysis program. By performing a computational fluid dynamics analysis, we were able to study exhaust flow, pressure drops, and fluid flow through the exhaust manifold. Multiple computer simulations were done to prove the design before we even had a physical manifold in our hand.

Once the manifold was fully passed on the computer we had the exhaust manifold CAD file transferred to a rapid prototyping machine. A polycarbonate exhaust manifold was cast from the prototyping machine. With this plastic manifold we were able to mock everything up in the test vehicle before proceeding to the next process.

From the polycarbonate piece we were able to cast a metal piece for prototyping. The metal used for the prototype and the production manifold is Inconel 625. Inconel is a very high quality (yet expensive and difficult to machine) metal that is used extensively in the racing and aeronautical industry (Audi Sport sells an Inconel exhaust manifold for $10,000). Inconel has excellent heat retention characteristics that work to enhance turbo response by keeping exhaust velocities high. We guarantee that this manifold will never crack. Furthermore, the production manifold is cast using a lost-wax process versus a traditional sand-casting process. This process is more expensive but gives a much higher quality part with better tolerances, no parting lines, and a smoother surface finish (the internal surfaces feel like they have been Extrude Honed).

The exhaust manifold is mated to a Garrett turbocharger that replaces the stock Triple K K03 turbocharger. We chose to use a Garrett turbocharger in lieu of a Triple K unit for several reasons. First of all, the new Garrett GT-Series is a more efficient design than the old Triple K K-24 turbocharger used by one of our competitors (the K-24's design dates back to the mid 70's). The Garrett turbocharger we have selected is a 1990's design. Also, Garrett turbochargers are available in a wider variety of configurations than the Triple K line, which allowed us to find a more exact match. The stock injectors are maxed out at power levels much over 220HP and consequently the fuel injectors have been replaced by larger units. Dialing in the injectors required many hours on the chassis dynamometer to achieve the proper fuel mixture throughout the entire rpm range.

APR announces the Stage III+ kit, the ultimate turbo system upgrade for the 2001 A4 1.8T. This kit is capable of 333 horsepower and 322 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
* All Associate Plumbing and Hardware
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.

APR is proud to release our newest addition to the APR Motorsport lineup, APR Throttle Body Hoses for the 1.8T. We designed these hoses to fill a gap in the market where other silicone hoses simply don't perform.

After extensive testing our engineers have found that the OEM throttle body hose is not rigid enough to prevent flex during high boost situations where getting airflow to the motor is most important. A flexed hose like the factory one creates delayed throttle response and pressure drop.

Our engineers designed a replacement hose made of high quality silicone to minimize flex and get the pressurized air to the motor faster. APR Motorsport Hoses also have smoother transitions to help increase air velocity.

APR Motorsport Throttle Body Hoses are available in three colors; blue, black, and red. All APR Motorsport Hoses include everything you need for complete installation, including fittings and clamps.

APR/Brembo braking systems are engineered for your specific Audi model. Brembo is the world leader in engineering, development and production of high performance braking systems and components. Brembo makes performance braking systems that exceed the demands of today's technically advanced Audi.

Equally important is Brembo’s total committment to manufacturing and quality assurance. To guarantee quality and performance, Brembo controls every step of the process, forging rotors and calipers in their own foundries, manufacturing components to the highest standards in the industry and testing each component as many as 500,000 cycles.

APR/Brembo brake’s level of technology and performance is unrivaled by any other product on the market. By utilizing larger calipers and discs, thermal capacity and brake torque is
increased. This potent combination offers the extreme in Brembo’s leading edge technology for high performance street or track use applications.

APR/Brembo brake systems are fully compatible with the stock ABS and ESP control systems. All of the necessary hardware is included to insure seamless installation.

APR is proud to be the Authorized Distributor for Carbonio Cold Air Intake (CAI) systems. Manufactured from aerospace grade carbon fiber, Carbonio further improves this material by incorporating a proprietary thermal barrier layer in its construction. The result is an exceptionally light and strong part that minimizes intake temperatures. This ensures that the engine optimizes power by receiving the coldest and most oxygen rich air possible.

Carbonio's line of intakes for Audi automobiles represent the pinnacle of induction design. Extensive testing has resulted in an intake that maximizes performance in all driving conditions. Power will come on sooner and the engine will pull for longer and stronger.

Benefits of the Carbonio CAI System include:

* Increases Horsepower and Torque
* Improves Throttle Response
* Decreases Turbo 'Lag'
* Flattens Torque Curve (engine is less 'peaky')
* Improves Fuel Economy
* Enhances Engine's Volumetric Efficiency
* Enhances Sound of Turbo Diverter Valve
* Works with All Aftermarket Diverter Valves
* Installs in an Hour (does not require bumper or headlight removal)
* Maintains All Factory Emissions Components
* Fits Both Manual and Automatic Transmissions
* Unique Thermal Barrier Composite Construction Ensures Low Inlet Temperatures
* Fully Compatible and Complimentary with APR Software and Exhaust systems

Each Carbonio A4 Kit Includes:

* Aerospace Grade Carbon Fiber Main Section Ensures Inlet Temperatures Stay Low
* Carbon Fiber Main Section has Show Quality Finish
* Complete Photographic Instructions
* Filter Design Eliminates Need for Secondary Air Pump
* All Necessary Hardware Included for Easy Install without Cutting Or Modifying
* Works on APR Stage III+ Cars with Larger MAF

Highlights of the APR R1 Diverter Valve Include:

* Diaphragm-Based Valve
o High-Temperature, Nomex-Reinforced Material for Extreme Durability
o Zero-Friction
o No Sticky O-Rings to Maintain and Grease
o No Pistons to get Stuck
o Consistent Performance Year Round
* Flow-Optimized, Investment-Cast Main Housing
* Stainless Steel Vacuum Fitting
* Zero-Maintenance Design
* Built with Finest Materials and Surface Treatments
* Fully Machined and Assembled at APR Headquarters in the United States for Optimal Quality Control

The APR R1 diverter valve was designed to be the ultimate solution to the problem of unreliable factory and aftermarket diverter valves and to be the leader in performance. Although most are of good design, factory diverter valves are built in a very conscious manner and the materials and overall life and reliability suffer. For the performance enthusiast, the diverter valve is an important component whose proper operation is paramount to optimal engine operation.

Enter the R1: APR’s R1 diverter valve addresses all of the reliability problems of the factory-supplied diverter valves and aftermarket replacements and takes performance to the next level. The R1 is a diaphragm-based valve. A diaphragm is the best option for a diverter valve for several reasons. First off, a diaphragm has negligible friction. Piston-based valves have considerable friction from the piston, o-ring, and bore assembly. The lower friction R1 diaphragm equates to faster response and better overall performance. Secondly, diaphragms do not require the periodic greasing that piston-based valves do. Piston-based valves must be qreased periodically (usually every year or sooner), requiring removing the valve from the car, disassembling and reassembling the valve. The APR R1 was designed to be maintenance free for the life of the product. Thirdly, a diaphragm based valve will never have a stuck piston. Piston-based valves periodically incur stuck pistons (especially if the required maintenance schedules are not followed.) Due to the lack of a piston, the APR R1 solves this problem.

The R1 is designed for optimal performance. The main body of the valve is investment cast in an aluminum alloy. By utilizing this casting process in lieu of a more conventional machining process, APR was able to optimize the internal geometry of the valve to provide the ultimate in flow performance. This geometry cannot be created utilizing conventional machining. As such, the APR R1 has much better flow characteristics than other diverter valves. Combined with the low friction diaphragm assembly, this equates to a valve that is truly a performance leader.

The materials used in the R1 are standard setting. The diaphragm is created out of high temperature material and incorporates a Nomex fabric reinforcement layer for enhanced durability and a diaphragm that will never tear. The alloy main body is finish machined at APR and receives a multilayer corrosion resistant and cosmetic enhancing finish. All machining and final assembly takes place at APR headquarters in the United States for optimal quality control and consistency.

APR now offers a complete coolant line kit for your 1.8T with a Garrett or KKK turbocharger. These lines look great and include all the necessary hardware.

Show your APR pride with our APR Tuned badges. Our badges have a polished chrome finish to keep a factory-like look over the years. The badge is approximately 2 3/4" long and 1 1/2" tall, and nicely replaces the stock engine designation badge on the back of the car.

The APR Boost Gauge utilizes a VDO boost gauge contained in a vent-replacement pod. The pod was designed on the computer with Pro-E for the best in fit and finish and is injection molded in plastic, giving you factory-like look and feel. The gauge itself is a 52mm mechanical VDO gauge giving very accurate and reliable boost and vacuum readings. It reads from 30 in. Hg of vacuum to 25psi of boost. For higher boost systems, a 0-30psi gauge without vacuum reading is available.