Audi A4 / A5 B9 2.0 TFSI Valved Exhaust System (2017-2021)

Which valved exhaust for an Audi A4 or A5 B9 2.0 TFSI?

The Rog system for the Audi A4 and A5 B9 2.0 TFSI (2017-2021) is a valved cat-back exhaust in 304 stainless steel or titanium, built to your VIN for the 190 and 252 hp versions, in sedan and Avant form. For the A5, whose rear section depends on the body style, the VIN confirms the system before production; valves open, the four-cylinder finally comes out of its shell.

Sound, options and fitting in detail: our Audi A4 / A5 B9 2.0 TFSI guide.

On the A4 and A5 B9, the 2.0 TFSI is a turbocharged four-cylinder whose turbine already absorbs part of the noise, and the factory exhaust smothers what remains. Freed, however, it has a hoarse, full voice, with a boost whoosh that blends with the bass every time you accelerate. Our valved cat-back lets that frank grain through at start-up; closed, it gives the Audi back the serenity of a cruiser.

The page covers 2017 to 2021 and shows two tunes: 190 hp and 320 Nm, or 252 hp and 370 Nm. It lists the A4 sedan and Avant, which take the same system, and the A5, whose rear section depends on the body style: your VIN confirms it before manufacturing. The previous B8 generation, the V6 S4 and S5 B9 and the RS4 and RS5 each have their own system.

Beyond the sound, the “Manifold” option replaces the downpipe, the first part after the turbo and home of the catalytic converter. On an A4 or A5 used for work as well as holidays, the 200-cell downpipe makes the most sense since it keeps emissions control, with the 100-cell accepted or not depending on the vehicle and your country’s rules and the decat version reserved for track use. With the Audi map, this part brings sound and a little weight saving; the horsepower requires an ECU remap.

No welding: clamps, gaskets, about two hours for an equipped workshop, and round exits. The valves respond to the drive modes if the car has them from the factory, or to the Rog remote, with its box in the trunk. As for the material, the A4 or A5 takes 304 stainless steel, robust and round, or titanium, around 40% lighter for the same design and more crystalline at high revs, in three finishes.