Audi A6 S6 RS6 C8
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A6 C8
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// The current super-estate

Audi A6 S6 RS6 C8

The C8 RS6 turned the formula up again - 600hp stock, mild-hybrid 4.0 TFSI, and tuning support that arrived almost immediately. Alongside it: the TDI S6 and the volume diesels, all with proven software gains.

Downpipes & exhaustsIntercoolers & coolingIntakesAir suspension & coiloversBrakesECU & gearbox tuningStyling
ChassisC8 (4K)
EnginesTDI range 4.0 TFSI MHEV
Production2018 - present
Layoutquattro
TDI40 - 50 TDI
2018-present 204-286hp
Software finds 50-60hp and big torque; GPF/AdBlue systems stay untouched.
S6S6 C8
2019-present 3.0 TDI e-boost 349hp
Europe's S6 went diesel - electric compressor keeps it responsive; maps add ~60hp.
RS6RS6 C8 Avant
2020-present 4.0 TFSI 600-630hp
Stage 1 ~750hp on the stock turbos. Performance (630hp) shares the same path.
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// The platform

750hp, warranty-grade manners

The C8 RS6 inherited the C7's engine philosophy and added mild-hybrid tech and even more headroom: Stage 1 software takes the 4.0 TFSI to roughly 750hp with the factory turbos and OPF in place. Because the engine carried over conceptually, the aftermarket was ready on day one - downpipes, cooling and gearbox software are all mature. The diesel S6 and TDI models tune just as predictably in their own lane: torque, economy, no drama.

The proven upgrade path

01
Stage 1
Engine + ZF8 software - ~750hp RS6, +60hp on the TDIs. The OPF stays.
02
Stage 2
Downpipes and intercoolers with a matched map - 800hp territory on stock turbos.
03
Control
Lowering module or coilovers, pads and discs sized for the pace - it's still a 2.1-tonne estate.
04
Beyond
Turbo upgrades are proven to four figures on this engine - scoped through our custom mapping.
// In-house ECU tuning
In-house ECU tuning for the 4.0 TFSI & TDI range
Stage 1-3 and custom mapping for the 4.0 TFSI & TDI range, all done in-house - the map to match the hardware above.
Explore ECU tuning →

C8 - frequently asked

Does tuning upset the mild-hybrid system?

No - the 48V MHEV system operates independently of the combustion calibration. Maps are developed around it and the car's coasting/start-stop behaviour is unaffected.

Stage 1 on the RS6 - what does it feel like?

Roughly 150hp and 160lb-ft over stock, delivered with factory smoothness. In-gear it's a different class of car; 0-60 drops into the low threes with launch control.

Are catless downpipes road-legal?

No - they're for off-road/track use and will fail emissions testing. Our OPF-back systems give the sound and flow gains while keeping the car compliant; listings are explicit about which is which.

Do you offer ECU tuning in-house?

Yes - Stage 1-3 and custom ECU mapping are done fully in-house. We don't currently offer parts fitting, but we're happy to advise on your install.

// Browse the range

C8 parts by category

C8 Downpipes & exhausts→C8 Intercoolers & cooling→C8 Intakes→C8 Air suspension & coilovers→C8 Brakes→C8 ECU & gearbox tuning→C8 Styling→