Back in 2016, BMW launched a limited-edition, track-focused M4 GTS and it was a pretty extreme iteration of the F82 generation model — but now another has been spotted testing in Germany dressed in an extreme looking aero kit.

To the untrained eye, it might look like the regular M4 GTS but upon closer inspection, you’ll note it has been fitted with a pair of front canards, side skirts, a larger diffuser, a bigger rear wing and a bootlid spoiler extension.

The fenders feature new vents along with a larger vent near the front wheels — and they’re functional — and should work wonders on the coupe’s downforce.

Clearly, this one is even more serious than the regular GTS. As a reminder, that has 493 bhp, 600Nm of torque, a top speed of 305kph and the ability to go from 0-100kph in just 3.8 seconds. The current model is no slouch however, this one could have more punch — and it will be limited to just 700 units.

BMW M has already confirmed the return of the legendary CSL badge as a replacement for the GTS, but that doesn’t mean this version won’t be lighter; the standard M4 GTS weighs 1,510kg meaning there is some room for weight saving which would bring it to the next track level.

This could be a fitting farewell to the F82 M4 before the next-generation model arrives in 2020.