Rolls Royce Wraith Exhaust System Left Right 7591641 7591640

For the Rolls-Royce Wraith (RR5), the part numbers 7591641 and 7591640 (often listed as 18307591641 and 18307591640) identify the Rear Exhaust Mufflers (Silencers) for the Right and Left sides respectively.

In 2026, these remain high-value items, crucial for maintaining the Wraith’s signature “silent performance” or as a base for aftermarket “Sport” tuning.

1. Component Details & Part Numbers

The Wraith’s exhaust system is a dual-path setup designed to handle the high heat and flow of the 6.6L Twin-Turbo V12 ($624\text{ bhp}$).

• Secondary Reference: You may also see the number 18307646986 associated with these parts, which is a superseded or regional variation used in later production runs.

2. Technical Features: The Active Valve System

The Wraith’s original exhaust is “intelligent.”

• Electronic Valves: The mufflers contain internal valves controlled by the vehicle’s ECU. At idle and low speeds, the valves stay closed to maintain “Rolls-Royce Silence.” Under hard acceleration or in “Low” mode, the valves open to reduce back-pressure and provide a subtle V12 growl.

• Material: High-grade T304 Stainless Steel. While highly resistant to rust, the internal baffles can occasionally vibrate or “rattle” in high-mileage cars, which is the primary reason for replacement in 2026.

3. Performance Upgrades (2026)

Because the standard mufflers are extremely quiet, many 2026 owners look for “Sport” alternatives that replace these specific part numbers:

• Quicksilver Sound Architect: A popular “Plug-and-Play” replacement that uses a mobile app to control the valves. (Estimated or the rear section).

• Mansory / Novitec (SPOFEC): These systems are significantly louder and often paired with larger chrome or carbon-fiber tips that exit through the rear bumper.

4. Installation & Compatibility

• Ghost (RR4) Compatibility: While the Wraith and Ghost share the same V12 engine, the Wraith mufflers are shorter and have different hanger positions than the Ghost sedan. Do not use Ghost mufflers (18307591632) on a Wraith, as the tips will not align with the bumper cutouts.

• Hangers & Gaskets: When replacing these, it is recommended to replace the Rubber Exhaust Hangers (18207578235) and the Graphite Gaskets (18307583344) to prevent cabin drones or exhaust leaks.

• Clamps: These mufflers are typically “sleeve-clamped” to the center pipes. If the original pipes are heavily corroded at the join, you may need to cut back the pipe and use an oversized stainless sleeve.

5. Troubleshooting: The “Valves Stuck” Fault

If you receive a “Drivetrain Malfunction” and the exhaust sounds unusually loud at idle, the Exhaust Valve Actuators (mounted on the mufflers) may have failed. In 2026, you can replace just the actuators (Part No. 18307812166) without replacing the entire $2,000 muffler assembly.