Alfa Romeo 4C 960 Valved Exhaust System (2013-2020)

The Alfa Romeo 4C 960 exhaust in detail.

The 4C is a wonderful anomaly: a carbon tub, mid-mounted engine, under a tonne, the recipe of a supercar in compact form. Its 1.75-litre turbo, mounted just behind the occupants, delivers 240 hp and 350 Nm, with a raw character that the factory exhaust does not take all the way.

On such a radical car, the exhaust sits a few centimetres from your ears, and it is the obvious modification. With the valves open, the valved Rog cat-back gives a hoarse, present sound, an audible turbo and crisp crackles on lift-off; with the valves closed, the 4C becomes presentable in town again. The contrast is striking, and you decide the volume.

All 4C 960s from 2013 to 2020 fall within the scope of the page, and we check each one’s VIN before manufacturing. Allow about two hours for fitting, no welding, with clamps and gaskets, with the factory valve control if the car has one, or the Rog remote.

The small turbo leads into a downpipe carrying the catalytic converter, which the page replaces under the “Manifold” option. Without an ECU remap, it acts on the sound and the weight, which counts double on a 4C; with one, it becomes a power lever whose result depends on the tune. Because a 4C remains a road car, the 200-cell downpipe, which keeps emissions control, is the most sensible option; the 100-cell will be accepted or not depending on the vehicle and your country’s rules, the decat being reserved for track use. On a sports car weighing less than a tonne, titanium, around 40% lighter than 304 stainless steel for the same design, makes perfect sense.