Original Exhaust System / Tunnel Heat Shield – Audi A7 Sportback 3.0 TFSI (Type 4K8) – 4K0825721G

Original factory underbody heat shield mounted above the exhaust system / in the center tunnel (exhaust heat shield / underbody heat insulation – Wärmeschutzblech Abgasanlage / Exhaust Heat Shield Underbody), designed for Audi A7 Sportback 55 TFSI and S7 (4K8 / C8 generation), manufactured from model year 2018 to 2026+, with particular consideration for versions with the turbocharged petrol engine 3.0 TFSI V6 (EA839 / DLZ / DLZA engine with 340 hp) with mild hybrid installation (MHEV 48V) and all-wheel drive quattro, based on the modular MLB Evo platform.

Original Audi OE group component made of multi-layer, extruded aluminum alloy with a sandwich structure (so-called stamped shell / waffle structure). It features exceptionally high thermal insulation, excellent reflection of infrared radiation (heat generated by exhaust pipes, catalytic converters, and OPF/GPF particulate filters) and effective acoustic vibration damping. The shield prevents the overheating of chassis floor elements, the drive shaft, 48V electrical installation harnesses, and passenger cabin soundproofing. Factory embossings guarantee structural rigidity and a lack of susceptibility to resonance at highway speeds.

Technical specifications:

• Catalog part number (OE): 4K0825721G / 4K0 825 721 G (and related engineering revisions from the 4K0825721, 4K0825721C, 4K0825721E, 4K0825721H)

• System / Category: Exhaust system and chassis / Heat shields, exhaust and center tunnel insulation shields (Heat Shield Exhaust Tunnel / Wärmeschutzblech)

• Mounting location: Vehicle underbody – center tunnel / above the exhaust pipe section (insulation between the exhaust and the body floor)

• Material: Stamped multi-layer technical aluminum with increased resistance to salt corrosion and thermal fatigue

• Dedicated engine: 3.0 TFSI V6 (55 TFSI / 340 hp, codes: DLZA) and related V6 petrol variants

• Dedicated model: Audi A7 Sportback (Type 4K8) and related MLB Evo platform models (Audi A6 C8 Type 4K)

• Production years: from 2018 to 2026+

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

• Condition: Original part, used (very good condition – healthy, undamaged structure, no wear marks, mounting holes and flanges for sheet metal screws/nuts are intact and not broken, no material fatigue cracks, factory geometry)

• Manufacturer: Audi AG (Original OEM)

Main application:

• Audi:

  • A7 Sportback 55 TFSI quattro (Type 4K8) – model years from 2018 to 2026+ (3.0 TFSI 340 hp engine)

  • A6 Sedan / Avant 55 TFSI quattro (Type 4K2 / 4K5 / C8) – model years from 2018 to 2026+ (3.0 TFSI engine)

  • S7 Sportback TFSI (Type 4K8 – non-European markets/USA) – model years from 2019 to 2026+ (2.9 TFSI V6 engine)

(Note: The shield's embossment pattern is designed for the exhaust manifold layout of the V6 TFSI engine versions. Before purchasing for the 2.0 TFSI / TDI versions, it is recommended to verify the shape and catalog number).

Installation and operating instructions

Each shield undergoes a check before shipping to verify the integrity of the flanges around the underbody mounting stud holes and to ensure the plane is not bent.

Fitment / installation note: In 3.0 TFSI engines, the exhaust system generates very high operating temperatures, and an efficient heat shield is crucial for protecting the 48V installation wiring and reducing the heating of the center tunnel in the cabin. In used shields, the mounting holes are a critical point, as galvanic corrosion and vibrations can cause them to break out – the offered item has fully preserved, rigid mounting points for the factory clamping nuts. Installation involves placing the shield on the welded underbody studs and tightening it with dedicated elastic washers. Using the original OEM shield guarantees no unwanted rattling and resonance during acceleration. Before purchasing, we recommend comparing the OE number stamped on the sheet or verifying it using the vehicle's VIN.