If you drive an Audi RS4 or RS5 B9 with the 2.9T twin-turbo V6, you know this engine is built for blistering performance—but the factory turbo downpipe is holding it back. Our
SS304 High Flow Exhaust Turbo Downpipe is the upgrade you need to unlock true power, sound, and response from your 2.9T.
Why Replace the Stock Downpipe?
The factory downpipe on the RS4/RS5 B9 is restrictive by design. It features a bulky primary catalytic converter that chokes exhaust flow, traps heat, and limits your engine’s true potential. Even with a tune, the stock downpipe creates backpressure that kills horsepower, slows turbo spool, and muffles the 2.9T’s aggressive growl.
Our high-flow downpipe eliminates this bottleneck. By removing the restrictive OEM cat and replacing it with a straight-through, high-flow design, you free up exhaust gases faster, reduce heat, and unlock noticeable performance gains.
Key Features of Our RS4/RS5 B9 Downpipe
-
Premium SS304 Stainless Steel Construction
Every pipe, flange, and weld is built from durable 304 stainless steel, TIG-welded by hand for strength and leak-free performance. This material resists corrosion, heat discoloration, and cracking, even under extreme boost and track conditions.
-
High-Flow, Straight-Through Design
The large-diameter piping and smooth bends eliminate the sharp angles and restrictions of the stock pipe. This reduces backpressure dramatically, letting your turbos breathe freely and spin faster. The result is faster turbo spool, improved throttle response, and noticeable horsepower and torque gains.
-
Precision Fitment for 2018-2023 RS4/RS5 B9 2.9T
Engineered to match the factory mounting points exactly, our downpipe bolts directly to your stock turbo and mid-pipe with no cutting, no welding, and no modifications. We include all necessary hardware, gaskets, and O2 sensor bungs for a seamless install.
-
Designed for Tuned & Modified Setups
This downpipe is ideal for tuned 2.9T engines, turbo upgrades, or anyone looking to maximize flow. The included O2 sensor ports ensure compatibility with factory or aftermarket engine management systems.
-
Aggressive, Unrestricted Exhaust Sound
Free from the stock cat’s muffling effect, our downpipe unlocks the deep, aggressive growl of the 2.9T V6. Combined with a cat-back exhaust, you’ll get a full, race-inspired tone without excessive rasp or drone.
Performance Benefits You’ll Feel
✅
Increased Horsepower & Torque: Reduced backpressure unlocks 15-30+ HP gains when paired with a custom tune.
✅
Faster Turbo Spool: Eliminates lag, making the 2.9T feel more responsive from low RPM.
✅
Lower Exhaust Temperatures: Improved flow reduces heat buildup, protecting your turbos and engine.
✅
More Aggressive Sound: Unleashes the true tone of your V6, without harsh cabin drone.
✅
Durable, Long-Lasting Build: 304 stainless steel construction stands up to daily driving and track use.
Why Choose Our Downpipe Over the Competition?
Unlike cheap, mass-produced downpipes, our unit is precision-engineered specifically for the B9 2.9T. Every weld, bend, and flange is built to last. We’ve optimized the flow path for maximum performance while maintaining a perfect fit, so you get the best of both worlds: power, sound, and reliability.
