Performance Air Filter for Audi A8 & S8 4N 3.0 & 4.0 (2017-2021)

High-Flow BMC Performance Air Filter for Audi A8,S8 (4N)

What it Does: The BMC Performance Air Filter directly replaces the restrictive factory paper element on the Audi A8 and S8 to lower intake pressure drop, increase volumetric airflow, and sharpen throttle response.

The Stock Audi A8,S8 Intake Restriction

Factory air filtration on the 4N platform relies on dense, tightly packed cellulose paper media. Under sustained load and boost buildup, these OEM elements generate significant manifold depression across the intake tract. High moisture and debris loading rapidly degrade flow capacity, creating parasitic drag on the turbochargers.

This restriction throttles intake air velocity, elevates compressor operating temperatures, and blunts transient throttle response on high-output EA839 and EA825 powerplants.

The Engineering Solution

Engineered to motorsport standards, this BMC panel filter replaces restrictive paper fibers with multi-layered, low-viscosity oiled cotton gauze clamped in an epoxy-coated alloy mesh. This architecture stabilizes air velocity entering the compressor inlets while maintaining strict ISO 5011 filtration efficiency down to 7 microns.

The filter features a one-piece polyurethane perimeter mold with zero welded seams, preventing air bypass and thermal deformation inside the engine bay. It drops directly into the OEM airbox housing with no trimming, plumbing changes, or MAF recalibration required.

Technical Specifications

Compatibility & OEM Reference

Fits the following vehicles (BMC fitment data):

• Audi A8 (4N) 50 TDI 3.0 (286 HP) | 2017-2021
• Audi A8 (4N) 55 Tfsi 3.0 (340 HP) | 2017-2021
• Audi A8 (4N) 60 TDI 4.0 (435 HP) | 2019-2020
• Audi A8 (4N) 60 Tfsi 4.0 (460 HP) | 2020-2021
• Audi A8 (4N) 60 Tfsi e 3.0 (449 HP) | 2019-2021
• Audi A8 (4N) S8 Tfsi 4.0 (571 HP) | 2019-2021

OEM Cross Reference (BMC): AUDI 4N0129620B, AUDI 4N0129620C

Frequently Asked Questions & Fitment Warnings

Does this fit the 4N A8,S8?

Yes, this is a direct fit for the Audi A8,S8 equipped with the EA839 and EA825 engine platforms, provided the factory airbox housing matches standard 4N filter specifications.

Will installing this performance filter trigger a Check Engine Light (CEL)?

No, the drop-in panel flows within factory ECU closed-loop mass airflow thresholds, retaining exact fuel trims without triggering engine codes.

The Audi Precision Standard

Maintaining high-performance European luxury requires components built to exacting tolerances. This filter provides race-grade air filtration and improved flow without disrupting factory sensor calibrations or requiring aftermarket intake modifications.