Audi RS5 B9 or Mercedes-AMG C63 W205? They're rivals, so owners often weigh one against the other. Here's how far each one goes, using the makers' and tuners' own figures from our two guides.
At a glance
| Audi RS5 B9 | Mercedes-AMG C63 W205 | |
|---|---|---|
| Years | 2018–2024 (facelift 2019) | 2015–2021 (coupé and cabriolet later) |
| Engine | 2.9 TFSI EA839 twin-turbo V6 | 4.0 twin-turbo V8 M177 |
| Stock power | 450 PS / 600 Nm (US 444 hp) | 476 PS (C63) / 510 PS (C63 S) |
Power by stage
| Audi RS5 B9 | Mercedes-AMG C63 W205 | |
|---|---|---|
| Stock | 450 PS | 476–510 PS |
| Stage 1 | 500–525 hp | 550–611 hp |
| Stage 2 | 525–605 hp | 590–667 hp |
| Stage 3 | 590–680 hp | 700–820 hp |
| Stage 4 | 710–740 hp | 830–950 hp |
Figures are the tuners' own claims from each guide, on the fuel each tuner states.
Typical parts cost
| Audi RS5 B9 | Mercedes-AMG C63 W205 | |
|---|---|---|
| Stage 1 | APR Stage 1 $899.95, or $1,799.95 as APR Plus with a limited powertrain warranty. | remaps €990 (BR-Performance), £720–£1,440 (Litchfield) or $1,999–$3,280 (Weistec, RENNtech); CPC upgrade for 2019-on cars $1,699 (Weistec); plug-in modules $767 (RaceChip) or €3,799 (DTE). |
| Stage 2 | APR high-pressure fuel pump (2.9T and 3.0T) $1,499.95. | downpipes $3,079 (Weistec) or £2,180.34–£5,746.14 (Milltek, track-only or with sports cats); CSF heat exchanger $749; Weistec airboxes $1,499; RENNtech R1 package $6,880. |
| Stage 3 | — | turbos €2,940.33 before VAT (TTE760+), $2,995 send-in (Pure900) or $5,499 (Weistec W.3); RENNtech turbo packages $13,840–$23,880; fuel pumps $4,280 (RENNtech). |
List prices from the guides, before shipping, import tax and fitting. "—" means that guide has no cost line for the stage.
Where each one ends up
At Stage 4 the Audi RS5 B9 reaches 710–740 hp and the Mercedes-AMG C63 W205 830–950 hp.