BMW 135i / 335i N54 or BMW M340i G20? Both use a BMW-built inline-six. Here's how far each one goes, using the makers' and tuners' own figures from our two guides.
At a glance
| BMW 135i / 335i N54 | BMW M340i G20 | |
|---|---|---|
| Years | 2007–2010 | 2019– |
| Engine | 3.0 twin-turbo inline-six N54 | 3.0 turbo inline-six B58 |
| Stock power | US 300 hp / 300 lb-ft; UK 306 hp / 400 Nm | 374 PS / 500 Nm |
Power by stage
| BMW 135i / 335i N54 | BMW M340i G20 | |
|---|---|---|
| Stock | 300 hp | 374 PS |
| Stage 1 | 360–400 hp | 400–460 PS / hp |
| Stage 2 | 380–440 hp | 460–500 hp |
| Stage 3 | 430–480 whp | 510–650 PS / hp |
| Stage 4 | 600–700 whp | 700–800+ whp |
Figures are the tuners' own claims from each guide, on the fuel each tuner states.
Typical parts cost
| BMW 135i / 335i N54 | BMW M340i G20 | |
|---|---|---|
| Stage 1 | MHD flasher €109 plus maps €59, Dinan $405, COBB Accessport $675 (ModBargains) or JB4 $479 (BMP Tuning). | 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 | VRSF downpipes from $285; VRSF intercooler from $379.99 on sale or Wagner EVO3 $1,150. | 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 | Pure Turbos Stage 2 £3,630.53 (R44 Performance); Fuel-It! port injection with JB4 $1,549.95; dual Walbro 450 pump $680. | — |
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 BMW 135i / 335i N54 reaches 600–700 whp and the BMW M340i G20 700–800+ whp.