Aston Martin DBS Exhaust System KY735230CB

part number KY73-5230-CB identifies the Genuine OEM Stainless Steel Rear Muffler Assembly (Muffler Quad SS) for the Aston Martin DBS Superleggera (2018–2024).

This is the standard factory-fitted exhaust unit. It is distinct from the optional “Full Titanium Exhaust System” upgrade, which is significantly lighter and carries a different part number.

1. Technical Specifications

• Material: High-grade T304 Stainless Steel.

   

• Configuration: Quad-exit design, specifically shaped to sit within the DBS Superleggera’s large carbon fiber rear diffuser.

• Active Valve Technology: The unit features integrated electronic bypass valves. These valves stay closed in GT Mode for a refined highway cruise and open in Sport/Sport+ modes to deliver the signature V12 roar and “overrun” crackles.

• Weight: Approximately 31 kg (68 lbs). In comparison, the Titanium upgrade sheds about 11 kg (24 lbs).

2. Common Issues & Maintenance

• Exhaust Valve Seizure: Over time, the internal butterfly valves can become “sticky” due to carbon buildup or heat cycles. If you notice the car sounds the same in all drive modes, the actuators or valves may be seized.

• Mounting Brackets: The DBS produces immense heat; check the rubber hangers and heat shielding during service, as the stainless steel expands and contracts significantly, which can stress the mounting points.

3. Market Pricing & Availability

Related Exhaust Upgrades

If you are replacing a damaged stock unit, you may also consider these popular performance alternatives:

• DBS Superleggera Titanium Exhaust Kit – The official Aston Martin upgrade. It is 35% lighter than the stainless steel unit and provides a much “raspier,” aggressive exhaust note.

• QuickSilver Sport Exhaust – A popular aftermarket option that retains the original tips but reduces weight and improves throttle response.

Are you looking to replace a damaged factory muffle