CTS - CTS-IT-300R - CTS Turbo Air Intake System - True 3.5" Velocity Stack
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For 2019-2022 Audi S4 Air Filter 85724MW 2020 2021 3.0L V6 Air Filter | eBay
K&N Air Filter Audi S4 4.2L V8 (03-09) Performance Replacement - 33-22 – Redline360
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Injen Cold Air Intake Audi S4 B8 & B8.5 3.0L V6 TFSI Supercharged Tuned Intake w/MR Tech.,SuperNano-Web Dry Filter and custom alum. Air Box cover, Wrinkle Black - SP3081WB
Air Filter, Performance (K&N) for B8 A4-A5-S4-S5 or Q5-SQ5 w/ 3.0T, 3.2L, and 4.2L
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Audi B8/B8.5 S4 Quattro 3.0T Intake Air Filter Parts - ECS Tuning
Finally some induction noise . . . - AudiWorld Forums
AFE Magnum FLOW Pro DRY S Air Filter for Audi S4 2.7T / Audi A6 2.7T / Audi Allroad 2.7t
Cabin Air Filter, (MANN) for B9 A4-S4, A5-S5-RS5, Q5-SQ5, Q7
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Audi S4 Replacement Air Filters - Mann, BMC Air Filter (LIFETIME), Mahle
CTS Turbo Audi B8/B8.5 S4, S5, Q5, SQ5 V6T Supercharged Air Intake System (True 3.5" velocity stack) - CTS TURBO
BMC F1 High-Flow Air Filter - Audi S4/S5/RS 4/RS 5 - Torrent Motorworks
Audi S4 3.0 TFSI K&N Air Filter
