Complete Rear Exhaust System: Center Silencer + End Silencers – 4K0253409 / 4K0253609A

Original factory exhaust system set (complete rear section consisting of a center silencer/resonator and a double end silencer assembly with inlet pipes), dedicated to Audi A7 Sportback (4K / 4K8 generation) and Audi A6 C8 (4K2 / 4K5 / 4KA type) equipped with a 3.0 V6 TFSI (55 TFSI designation / 340 hp) petrol engine and quattro all-wheel drive, produced from 2018 to 2026, based on the modular longitudinal MLBevo platform.

Original VAG exhaust system component. Made of high-grade stainless steel (acid-resistant / ferritic) with enhanced resistance to corrosion caused by road salt and exhaust condensation. The design ensures proper exhaust backpressure for the turbocharged 3.0 V6 unit with a GPF/OPF filter, factory-standard operating noise without unwanted droning at highway speeds, and a factory-standard, sporty sound at higher engine speeds.

Technical specifications:

• OE catalog part numbers:

  • Center silencer / resonator: 4K0253409 / 4K0 253 409 (interchangeable with revisions in the 4K0253409A, 4K0253409B, 4K0253409C series)

  • End silencer (left + right transverse assembly): 4K0253609A / 4K0 253 609 A (interchangeable with revisions in the 4K0253609, 4K0253609B, 4K0253609C series)

• System / Category: Exhaust system / Center silencers, end silencers, complete rear sections (Exhaust System Rear Muffler & Middle Silencer Set)

• Function: Wave resonance damping and acoustic silencing of internal combustion engine exhaust

• Engine version: 3.0 V6 TFSI (55 TFSI / 340 hp, engine codes DLZA and related)

• Drivetrain: quattro (all-wheel drive – pipe routing around the rear differential and suspension subframes)

• Construction: Stainless steel set with factory hanger rods and muffler heat shields

• Mounting location: Chassis – central and rear section (from the connection after the GPF/catalytic converter to the rear bumper)

• Dedicated model: Audi A7 Sportback (4K8 type) and Audi A6 C8 (4K type / Sedan / Avant)

• Steering side: Left (LHD) and Right (RHD) – universal component

• Condition: Original used part (100% functional – mufflers are sealed, no leaks, no perforation corrosion, pipes are straight without dents reducing flow, factory hanger rods are intact and undamaged)

• Manufacturer: Audi AG / VAG / Eberspächer / Boysen (OEM Original)

Main application:

• Audi:

  • A7 Sportback (4K8 type) – model years 2018 to 2026 (3.0 TFSI 55 TFSI quattro engine)

  • A6 / A6 Avant / Allroad (4K2 / 4K5 / 4KA - C8 type) – model years 2018 to 2026 (3.0 TFSI 55 TFSI quattro engine)

Fitment guarantee and VIN verification

The exhaust system undergoes pressure leak testing of the muffler casing seams and inspection of the flexible hanger points before being listed for sale.

Fitment / installation note: The start of the 4K0 number (exhaust system group 253) specifies the pipe routing geometry through the floor tunnel and around the rear suspension and quattro drive. The set consists of center resonator 409 and rear split section 609A. Using a complete original OEM system guarantees perfect fitment of the tips with the bumper diffuser, no stress on the rubber hangers, and maintenance of factory acoustic and emission parameters without generating exhaust pressure errors in the engine control unit. Before purchase, we recommend comparing the OE numbers stamped on the muffler casings or verifying according to the vehicle's VIN.