Audi S4 B9 or BMW M340i G20? 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 S4 B9 | BMW M340i G20 | |
|---|---|---|
| Years | 2017–2024 (Europe: petrol until 2019) | 2019– |
| Engine | 3.0 TFSI EA839 turbo V6 | 3.0 turbo inline-six B58 |
| Stock power | 354 PS / 500 Nm (US 349 hp) | 374 PS / 500 Nm |
Power by stage
| Audi S4 B9 | BMW M340i G20 | |
|---|---|---|
| Stock | 354 PS | 374 PS |
| Stage 1 | 430–450 hp | 400–460 PS / hp |
| Stage 2 | 445–470 hp | 460–500 hp |
| Stage 3 | 530–620 hp | 510–650 PS / hp |
| Stage 4 | 630–740 hp | 700–800+ whp |
Careful: one car's figures are at the wheels (whp) and the other's at the engine (hp), so they aren't directly comparable. Convert with the crank to wheel calculator.
Typical parts cost
| Audi S4 B9 | BMW M340i G20 | |
|---|---|---|
| Stage 1 | APR Stage 1 $1,299.99, or $2,299.99 as APR Plus with a limited powertrain warranty. | bootmod3 $595 plus a bench unlock ($215 mail-in, or $850–$1,500 FEMTO on 06/2020+ cars); BR-Performance €890; G-Power €1,995 fitted; plug-in boxes $599 (JB4) or €609 (RaceChip); xHP gearbox software from $299.99. |
| Stage 2 | APR Power Pack (tune, Ultralink, intake with turbo inlet) $1,599.95; Unitronic downpipe $2,634.99 (Black Forest Industries). | downpipe $479.99 (VRSF) to $1,424.99 (Active Autowerke); heat exchanger $699 (CSF) or $749.99 (Mishimoto); Eventuri intake $1,495; AWE exhaust from $1,755. |
| Stage 3 | APR DTR8868 turbo with Stage 3 software $3,099.95 (ORT Motorsport), £3,128.44 in the UK (AwesomeGTI). | — |
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 S4 B9 reaches 630–740 hp and the BMW M340i G20 700–800+ whp.
Read the full guides
- The Audi S4 B9 guide
- The BMW M340i G20 guide
- Compare other cars in the compare tool
- All comparisons