Performance Air Filter for Audi A8 S8 4.0L 4.2L FSI 6.3L FSI W12 EnginesSharper Induction for the Audi A8 & S8 (4H Chassis) CEUA, CDRA, & CEJA Powerplants Who Its For: Engineered for the Audi D4 (4H) enthusiast running the high output 4. 2L FSI, the massive 6. 3L W12, or the twin turbocharged 4. 0T S8. This is for the driver who wants their flagship sedan to breathe without the suffocating restrictions of factory paper elements. The Symptom: The factory intake system on the [CEUA CDRA CEJA] engine family is designed