BMW is prepping a hardcore M4 GTS

-    The focused M4 GTS could return as a last hurrah for the current-gen F30 3 Series.

-    It is also rumoured to have adopted the iconic CSL badging.

-    The test mule had aggressive aero bits while the power output could surpass the ‘standard’ GTS.

BMW might have sold out the limited edition M4 GTS producing just 700 units of the mad coupe. But the Bavarian carmaker was spotted doing trials on a test mule of the GTS with an added aggressive aero kit. We believe an even focused M4 GTS could return as a final act for the current-gen F30 before the new one arrives next year.

The test mule spotted near the carmaker’s headquarters in Munich had a revised aerodynamic kit which would look fitting on a track-only race car. Upfront, the famous orange lip splitters get addition canards on the side. The front fenders had an air intake on top, akin to the one seen on the ‘Ring record holder, Porsche 911 GT2 RS. A large vertical vent was housed behind the front wheels. The side skirts sported intricate shapes for a better airflow. The rear wing is in a rudimentary state right now, but it is definitely larger than the one on the GTS. The test mule failed to hide the additional rear diffuser beneath the integrated diffusers.

If rumours are to be believed, BMW is planning to bring back the iconic CSL moniker to replace the hardcore GTS variant. This hardcore M4 could be a fitting vehicle if the CSL makes its return since it is already lightweight and sporty, which the CSL badge stands for. Under the hood could be the same 3.0-litre turbocharged straight-six which powers the M3 and M4 range. However, the infamous water-injection system of the GTS might be abandoned. We expect a significant boost in the power figure over the limited run GTS which punched out almost 500bhp. 

There is no official word from BMW regarding a hardcore M4 or the GTS. This could even mean the carmaker is part testing on the GTS test mule for its future products and race cars. More details will be revealed in the months to come.