APR Cast Inlet Race Downpipe w/Cat (15+ A3, 15+ GTI/Golf FWD)

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SKU: 111045
MPN: DPK0027
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Product Details


APR is pleased to present the ultimate Cast Inlet Race DP Exhaust System for FWD 1.8T and 2.0T vehicles!

The APR Cast Inlet Race DP Exhaust System replaces the restrictive factory DP with a larger, 76mm stainless steel mandrel-bent system, featuring a port-matched 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. It’s one of the best performance upgrade for 1.8T and 2.0T engines following APR’s ECU Upgrades and it’s designed and assembled in-house, using premium materials and world-class manufacturing techniques few can match.

Dyno Numbers


APR Cast Downpipe - 2.0T Dyno Results


APR Cast Downpipe - 1.8T Dyno Results


Race DP with Cast Inlet

The APR Race DP features an investment-cast inlet, with a port matched v-band flange, creating an ideal flow path for exhaust gasses exiting the turbocharger. By matching the already oversized turbo outlet, the Race DP is able to maintain exhaust gas velocity, improving performance with minimal variances in cross-sectional area due to the strategic use of cast parts. Furthermore, the cast inlet allows for excellent packaging, satisfying other design criteria while maintaining a larger and constant cross-sectional area compared to mandrel bent tubing built to similar specifications. The end results are simple: Smooth exhaust flow and maximum performance!


The Race DP’s piping is upgraded to attractively-brushed, straight-through and mandrel-bent 76mm tubing, dwarfing the small 65mm factory system. Furthermore, components visible from the engine bay are tumbled for a more attractive finish. A CNC laser cut bracket provides a strong and accurately positioned mounting point to take the weight of the Race DP off the turbocharger, and the internally-corrugated flex section gives the Race DP the flex it needs under engine movement. Finally, the Race DP uses T304 stainless steel components that are TIG welded together with argon back-purging, ensuring the system not only looks great on the inside and out, but stands the test of time.

Flex Section

The APR midpipe use an 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. The flex section is constructed from T304 stainless steel and is argon back-purged when TIG welded to the Race DP.

Catalytic Converter

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 design.

Internally the catalytic converter feature a proprietary wash coat that helps to reduce emissions and smell common on cat-less setups. The low-profile catalyst features a fully captured substrate brick, which is furnace brazed 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.


Attached to the Race DP is a high quality mounting bracket. The bracket is constructed from T304 stainless steel and is CNC-machined and CNC-bent to exact tolerances. The bracket is TIG welded to the piping and argon back-purged.

Designed to stand the test of time, the adjustable bracket is CNC machined from 8mm-thick billet T304 stainless steel and the hanger feet are threaded into place, eliminating the need for welds. Weight is removed from the bracket, wherever possible, while not hindering its structural integrity. The bracket attaches to the Race DP’s integrated mounting bracket with the included hardware.


Our system uses OEM-style low-profile slip clamps 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 Inlet Race DP Exhaust System all the way down to the oxygen sensor bung. APR’s O2 bung is investment cast from T304 stainless steel and is curved to perfectly fit on the catalyst, without protruding into the pipe, as this would further impede airflow beyond the sensor itself. The bung is TIG welded to the piping and argon back-purging is used to ensure the interior surface is smooth and clean.


A simple and removable, T304 stainless steel reducer, featuring a smooth transition, is included, making the APR Cast Inlet Race DP Exhaust System directly compatible with the OEM catback exhaust system.


A high quality oxygen sensor extension harness is included as the catalyst and sensor bung is relocated further away from the turbocharger.

Optional Universal 76mm Catback Fit Kit

APR’s cast Race DP exhaust system mates perfectly to the factory catback exhaust system with the included reducer. For compatibility with most 76mm catback exhaust systems, a 76mm link pipe must be installed between the Race DP and catback. APR’s universal fit kit includes a 300mm link pipe and clamp that can be cut to length for compatibility across a wide range of systems.

Stage II ECU Upgrade Information

For the best results, APR recommends installing the Stage II ECU Upgrade. This upgrade requires purchase of an APR Stage I ECU Upgrade, and is included for free to the original owner and original vehicle with the purchase of an APR Cast Race DP Exhaust System!

Emissions Disclaimer

  • This product is sold for off-road use only.
  • By purchasing this product, you understand this product is sold for competition use and is not legal for use in highway or street vehicles.
Product Features

  • More power, torque & less lag - +28 HP & +90 FT-LBS over stage 1!
  • Larger, 76mm system - Say goodbye to the restrictive 65mm system!
  • Cast Inlet with port-matched v-band flange - Unrestrictive flow for maximum performance!
  • Premium T304 stainless steel construction - Only the best to resist corrosion and stand the test of time!
  • Premium argon back-purged TIG welding - Clean, strong and attractive welds, inside and out!
  • Strong GESI high-flow catalytic converter - Reduced emissions, smell and noise without the power hit!
  • OEM-style slip-on clamps - Slip on and go with no pipe deformation!
  • OEM-style internally-corrugated flex section - Flex without the common failures and restrictions!
  • In-house design, assembly and quality control - Engineered from concept to reality to be the best!
  • Plug and play - Bolt on and go with the included instructions and replacement driveshaft bolts!
  • APR Stage II ECU Upgrade price waived - Upgrade from APR Stage I to APR Stage II for free!
  • Limited lifetime warranty - The best system with the best warranty!

  • Limited lifetime warranty.

Fitment Guide

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Fitment Guide

Fitment Guide

Start Year End Year Make Model Submodel Cyl Lit Fuel FuelDel ASP EngDesg Notes
L4 1.8
L4 1.8 GAS FI T ALL  
L4 1.8 GAS FI T ALL  
L4 2.0 GAS FI T ALL  

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