If your car left the factory with exhaust valves, it does not have the same rear section as the same model without them. The valve bodies sit inside the system, the actuator motors mount to it, and the control wiring runs to a specific place. An aftermarket rear section built for a non-valved car can physically fit and still leave you with a valve system that has nothing to control.
The valve needs a motor mount, a reference for its range of travel, and a path for the control signal. On some platforms the factory control module continues to drive the valve once the hardware is present and correctly referenced. On others the behaviour changes and the driver notices - a warning, a valve that stays open, or a valve that no longer cycles as it should.
Say whether your car has factory valve control, and if it does, whether the rest of the system is still factory or has already been altered. Tell us the chassis code, build year and market as well, because valve provision varies by market on the same platform.
Does the rear section have the actuator provision you need? Where does the control cable or loom route? And does the product information state that valve function is retained - and if so, retained how? If a listing is silent on those three points, ask. Silence usually means the part was developed on a non-valved car.
It is one question at the enquiry stage, and it determines which rear section you need. Getting it wrong means a part that fits and still disappoints - the most avoidable outcome there is.
