Ford Focus ST MK4 Valved Exhaust System (2019+)

Which valved exhaust for a Ford Focus ST MK4?

The Rog system for the Ford Focus ST MK4 (from 2019) is a valved cat-back exhaust in 304 stainless steel or titanium, built to your VIN for the 280 hp, 420 Nm 2.3 EcoBoost. Valves open, the hatchback gains a full, snarling tone with the turbo audible; closed, it regains the discretion of a family car.

Sound, options and fitting in detail: our Ford Focus ST MK4 guide.

The fourth-generation Focus ST, launched in 2019, has a genuine sporting character: 280 hp and 420 Nm from a turbocharged EcoBoost engine, sharp response and generous torque. As is often the case at Ford, the factory exhaust is calibrated for emissions standards, and the voice does not match the temperament.

With the valves open, the Rog valved cat-back gives the hatchback a full, furious tone, an audible turbo and clear crackles on the overrun; with the valves closed, the ST regains the discretion expected of a family car. The more radical Focus RS Mk3 is covered on another page, and the ST MK4 this page is for is checked against its VIN before manufacturing.

Fitting is done with clamps and gaskets, without welding, in about two hours, and the factory valve control is retained if the car has one, with the Rog remote, its unit in the trunk, taking over otherwise.

For owners tuning their ST, the downpipe placed behind the turbo, with its catalytic converter, is available under the “Manifold” option. Fitted alone, it only changes the voice and the weight; with an ECU remap, it becomes a power lever whose result depends on the tuning. An ST MK4 that also carries the family will keep the 200-cell downpipe, which retains emissions control; the 100-cell will be accepted or not depending on the vehicle and your country’s rules, and the decat version is reserved for track use. The system is ordered in 304 stainless steel or titanium, a metal around 40% lighter that comes in three finishes under the ST’s diffuser.