B9 T304 Stainless Steel 3" Downpipe

The ECS Tuning High-Flow Downpipe is a full 3.0-inch T304 stainless steel system designed to replace the restrictive factory unit. With smoother exhaust flow and reduced backpressure, it sharpens throttle response, deepens exhaust tone, and unlocks hidden power potential especially when paired with an ECU tune.

Tested on a Stage 1 tuned Audi B9 A4, ECS recorded gains of +14 whp and +13 ft-lb of torque with the downpipe installed alongside supporting mods. Real power you can feel every time you hit the throttle.

Handcrafted from mandrel-bent T304 stainless steel, this downpipe resists corrosion and ensures smooth airflow. ECS backs the design with a five-year limited warranty and a perfect-fit guarantee for total peace of mind.

Every downpipe ships with new gaskets, clamps, and hardware. Designed to bolt directly into OEM mounting points, it's a clean, no-cut install you can tackle in the garage.