F82 Tuning

The F82 was the first M4 — the 2014 moment BMW split the coupe off from the M3 badge — and its most interesting chapter is one of the stranger engineering footnotes in modern performance: the M4 GTS.

The GTS is the production car that pioneered water injection. To run more boost without detonation, BMW sprayed atomized water into the intake to cool the charge — enough to lift boost from the standard car's 2.2 bar to 2.5 and output to 493 hp, in a stripped, track-focused run of roughly 700 cars (about 300 to North America). Whatever you make of how it drove, the tech was real and years ahead of the field. Between it and the 460-hp CS, the F82 has genuine collector chapters — while the regular Competition (444 hp) has settled into one of the better-value used M coupes you can buy.

Every F82 shares the S55, though, and the S55 means the conversation starts at the crank hub — the friction-fit timing weak point the whole platform's tuning is built around fixing first (full story on the F80 page; same job here). Sort it, and the stock-turbo headroom is right there: tuners see 580–630+ wheel horsepower on E85.

So the F82 spans an engineering curiosity at the top and a sharp used-M value below — all of it gated, like every S55, on doing the crank hub before you reach for the power.