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Milltek — Audi RS6 (C7 / C7.5 — 4.0 TFSI) — Performance Exhaust — Specification
Model fitment
Designed for Audi RS6 / RS7 C7 / C7.5 4.0 TFSI bi-turbo (fits 2013–2018 model years; applicable to 2017 C7.5 facelift when correct variant chosen).
System types (options)
🛒 Resonated *Quietest* (SSXAU364)[contact support for this option]
🛒 Road Plus *Quieter* (SSXAU579)[contact support for this option]
🛒 Non-Resonated *Louder* (SSXAU365)[contact support for this option]
Resonated Valved Cat-Back — quieter, OE+ tone (valves operable). Common Milltek part: SSXAU364.
Non-Resonated Cat-Back / Turbo-Back — more aggressive tone; options include non-resonated cat-back or full turbo-back (with choice of 100-cell hi-flow sports cats or cat bypass). Example part ranges: SSXAU365 / SSXAU595 (turbo-back / 100-cell options listed by retailers).
Road+ (OE-style) Cat-Back — uses OE tips, drop-in appearance, part references such as SSXAU579 in some catalogs.
Materials & construction
Stainless steel construction (Milltek commonly uses 304L / premium stainless steel). TIG-welded mandrel-bent pipework for smooth flow and durability.
Pipework diameter
Typical Milltek cat-back pipe diameter for RS6 C7/C7.5: 2.75" (≈69.85 mm). Turbo-back / downpipe options may increase to 3.0" (≈76 mm) on some high-flow/turbo-back kits.
Exhaust tips / finish
Options: Milltek-branded polished stainless tips or use of OE tips (Road+ options). Tip finish and shape vary by kit—round quad tips are typical on RS6 systems.
Valving & electronics
Valved systems retain factory style exhaust valves. Note: Milltek typically does not supply replacement valve motors — the OE valve motors are required for fitment (or reuse OEM units).
Performance notes
Improved exhaust flow vs stock → modest horsepower/torque gains depending on exact system and whether supporting mods (downpipes, remap) are fitted. Non-res / turbo-back + 100-cell cats or decats + ECU remap yield the largest gains. Some turbo-back options require Stage-2 ECU tune and lambda extension leads.
Acoustics / sound
Resonated valved cat-back: OE+ / deeper but refined tone.
Non-resonated / turbo-back (non-res): louder, aggressive RS-style bark — depends on 100-cell cats or cat-bypass selection.
Fitment / installation
Direct-fit cat-back for RS6 C7 / C7.5 in most kits; turbo-back options may require additional modifications (cutting of OEM piping in some C8 conversions, lambda extensions for some turbo-back builds). Confirm exact part number for your VIN / sub-model (saloon vs Avant, performance edition variations).
Compliance & notes
Many Milltek systems are E-marked / road-legal options where specified; some non-res / decat / bypass choices are for track or off-road use only — check local regulations. Retailers will indicate E-marked status per part.
Typical part numbers (examples; verify for exact vehicle)
SSXAU364 — Resonated Valved Cat-Back (Milltek official listing).
SSXAU365 / SSXAU579 — various cat-back / Road+ variants seen in retailer listings.
SSXAU595 — Turbo-Back / non-res with 100-cell options (example listings).
Accessories / requirements
OE valve motors (if retaining valved operation), possible lambda extension leads for turbo-back options, ECU remap recommended for turbo-back or decat installs to avoid check-engine issues and to optimize gains.
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