The APR DPK0019 Cast Downpipe Exhaust System replaces the restrictive Audi factory downpipe and chambered resonator with a larger, 76mm stainless steel mandrel-bent system, featuring a bell-mouth cast inlet, high-flow catalyst and various other features. Expect better throttle response, more horsepower and an intoxicating exhaust note, while remaining civilized during normal daily driving. The APR DPK0019 is one of the best performance upgrades for the 2.0 TFSI following the APR ECU Upgrade and it’s all designed and assembled in-house at APR, using premium materials and world-class manufacturing techniques few can match.
APR DPK0019 highlights:
- Investment cast downpipe inlet.
- T304L stainless steel construction.
- 300 cell, 100mm x 100mm GESi catalyst.
- Low profile, sealed/corrugated flex section.
- 80mm (3.15") inlet with integrated flange.
- 76mm (3.0") outlet.
- Argon back-purged TIG welding.
- Brushed and de-burred piping.
- Machined stainless bracket.
- Non-swedged/slip-fit/flanged piping.
- Investment cast O2 bungs with billet plugs.
- OEM-style slip-on clamps.
- Reducer for OEM catback compatibility.
- APR Stage II ECU Upgrade price waived.
- Limited lifetime warranty.
The factory downpipe system consists of smaller, 63mm (2.5") piping with varying bends and multiple restrictive high-cell-count catalysts, all of which contribute to a less than ideal flow path and hindered performance. APR’s engineers took a multi-step approach to maximizing flow, reducing under hood temperature, and eliminating unnecessary restrictions all in a unique package only APR can deliver.
The APR downpipe features a strong, investment cast, T304L inlet and outlet designed to maximize flow and minimize turbulence. By casting the inlet, APR’s engineers were able to create a smooth and high-flow exhaust path that maximizes flow through swept blends and shapes that are otherwise not possible through conventional fabrication techniques. The inlet perfectly matches the factory turbocharger’s 80mm outlet and gradually necks down to further enhance performance. The mounting flange is integrated into the casting, and TIG welding at the flex section ensures a clean inner surface eliminating turbulence, vortices and eddies to the highest degree.
With a nominal wall thickness of 2.55mm the APR downpipe is strong and produces a refined exhaust note compared to thin wall tubing systems. The cast sections undergo a tumbling process to smooth and de-burr any imperfections inside the pipe, while simultaneously enhancing the exterior finish. Lastly, all necessary surfaces are CNC machined for an accurate fit.
APR’s engineers specified a T304L stainless steel, OEM-style flex section that is fully sealed with a corrugated inner lining to improve flow and reliability. The low profile design and minimal use of bradding material eliminates clearance issues common with other designs that can billow, rub, rattle and fray over time.
Designed to stand the test of time, APR's bracket is CNC machined from stainless steel. Weight is removed from the bracket, wherever possible, while not hindering its structural integrity.
The APR Downpipe features premium grade T304L stainless steel for its excellent appearance, strength and corrosion resistance properties. The pipe is rolled to the 76mm European standard diameter with a 1.5mm wall thickness and a seemingly non-existent weld seam. Pipe is cut to length in-house via APR's CNC-controlled bandsaw to an accuracy of .25mm, ensuring a precise fit. Each pipe is de-burred, and the exterior finish is brushed to give the exhaust piping a clean and attractive appearance worthy of the APR name. APR’s fabrication team uses argon back-purging during the welding process, leaving a clean and smooth interior surface, and TIG welding for strength and appearance. Lastly, no swedging or slip-fitting is necessary due to APR’s OEM-style clamp design, leaving smooth and less turbulent connection points.
APR’s engineers specified a T304L stainless steel, OEM-style exhaust clamp designed to eliminate the need for flanges, swedging, or slip fittings. By using this low profile design, the exhaust system can be positioned higher in the exhaust tunnel and away from the ground with better clearances compared to flanged setups. Each clamp allows for less turbulence and greater accuracy at the connection points as the pipes simply butt up to one another rather than the ambiguity and voids associated with swedged slip fittings. Furthermore, the clamp doesn’t rely on deforming the pipe to provide a tight seal, making install and removal more convenient.
APR’s Engineers paid special attention to the details when designing the APR Cast Downpipe Exhaust System all the way down to the oxygen sensor bungs. APR’s O2 bungs are investment cast from T304L stainless steel and are curved to perfectly fit on 76mm piping, without protruding into the pipe, as this would further impede airflow beyond the sensor itself. The bungs are TIG welded to the piping and back-purging is used to ensure the interior surface is smooth and clean. Lastly, a billet T304L stainless steel bung plug is included to cap off extra ports not needed on some models.
APR’s engineers specified a high-quality and high-flow GESi metal 300-cell catalyst ideal for forced induction application. During dyno testing, the 100mm x 100mm design showed no measurable loss in power, thanks to the catalyst’s specifications. Internally the catalytic converter features a proprietary blend of precious metals and loading technology that helps to reduce emissions and smell common on cat-less setups. With performance in mind, the catalyst is placed far away from the turbo outlet to reduce turbulence in the downpipe and to help reduce under-hood temperature. The low-profile catalyst features a fully captured substrate brick, which is furnace braised to the outer mantle and physically captured by the diffuser cones preventing rattling, rotation, and damage to the substrate. Subsequently, a byproduct of running the catalyst is a reduction in noise, making the system as a whole more pleasing to the ear.
A simple and removable, T304L stainless steel reducer, featuring a smooth transition, is included, making the APR Cast Downpipe Exhaust System directly compatible with the OEM catback exhaust system.
APR DPK0019 Downpipe Vehicle Fitment:
The APR DPK0019 downpipe is designed to fit the following vehicles.
- 2009 Audi A4 2.0T Quattro A/T
- 2010 Audi A4 2.0T Quattro A/T
- 2011 Audi A4 2.0T Quattro A/T
- 2012 Audi A4 2.0T Quattro A/T
- 2013 Audi A4 2.0T Quattro A/T
- 2014 Audi A4 2.0T Quattro A/T
- 2015 Audi A4 2.0T Quattro A/T
- 2016 Audi A4 2.0T Quattro A/T
- 2009 Audi A5 2.0T Quattro A/T
- 2010 Audi A5 2.0T Quattro A/T
- 2011 Audi A5 2.0T Quattro A/T
- 2012 Audi A5 2.0T Quattro A/T
- 2013 Audi A5 2.0T Quattro A/T
- 2014 Audi A5 2.0T Quattro A/T
- 2015 Audi A5 2.0T Quattro A/T
- 2016 Audi A5 2.0T Quattro A/T
- 2012 Audi allroad 2.0T A/T
- 2013 Audi allroad 2.0T A/T
- 2014 Audi allroad 2.0T A/T
- 2015 Audi allroad 2.0T A/T
- 2016 Audi allroad 2.0T A/T
- 2009 Audi Q5 2.0T A/T
- 2010 Audi Q5 2.0T A/T
- 2011 Audi Q5 2.0T A/T
- 2012 Audi Q5 2.0T A/T
- 2013 Audi Q5 2.0T A/T
- 2014 Audi Q5 2.0T A/T
- 2015 Audi Q5 2.0T A/T
- 2016 Audi Q5 2.0T A/T
APR DPK0019 Downpipe Manufacturing:
Manufacturing takes place both internally and externally to APR while finishing and assembly is completed in-house. APR’s fabrication team cuts, brushes and de-burrs premium grade T304L stainless steel piping for use in each midpipe. Then each cast component is sent through the ceramic vibrating tumblers to smooth and de-burr surface imperfections. Each component is then cleaned by hand and prepared for assembly. APR’s fabrication experts TIG weld each component, creating reliable, high quality and attractive welds. Each component is back-purged with argon during the process ensuring the weld is strong and consistent, as well as clean throughout. With this process complete, the APR Cast Downpipe Exhaust System is born!
APR DPK0019 Downpipe Install:
Installation of APR downpipes typically takes 2-3 hours. Basic hand tools are necessary for installation, no cutting or welding is required. The APR downpipe is designed to work with the OEM catback section or any aftermarket catback which is designed to work with the OEM downpipe. Please observe all safety precautions and follow proper installation guidelines while working on your vehicle.
APR DPK0019 Downpipe Warranty:
APR downpipes are warranted to be free from defects in the materials and workmanship prior to installation. This warranty does not cover labor, misuse, faulty installation, failure of related parts or parts purchased other than from APR, LLC. This warranty extends to the original purchaser for as long as they own the vehicle and the exhaust.