The redesigned BMW M4 has just reached showrooms but the Bavarian brand looks to have something else up its sleeves: a hotter CS or CSL version.
Our spy photographers captured this camouflaged M4 prototype that features numerous enhancements, suggesting it could be a CS or an even spicier CSL.
There’s a more aggressive splitter up front, while this prototype looks to be sitting lower than the M4 and M4 Competition.
Down back, there’s a larger rear spoiler and diffuser.
This prototype also wears striking multi-spoke wheels, behind which sit carbon-ceramic brakes.
A user on the BimmerPost forums shared a list of BMW’s future product plans, reportedly sourced from insiders, and noted an M4 CSL is in the works.
It’ll reportedly start production in July 2022 and will have a “very short production run”.
Introduced locally in 2017 and limited to 3000 units globally, the last M4 CS featured a bump in power and torque over the Competition (7kW and 50Nm)
It also featured extensive use of carbon fibre and carbon fibre-reinforced plastic to keep weight down, with these materials used on the front bonnet, splitter, roof and rear diffuser.
There were also bare interior door panels with fabric door pulls, plus extensive use of Alcantara trim.
E46 M3 CS 
F82 M4 CSL
It sat above the Competition but above the GTS, a nameplate that’s been retired.
In its place, BMW officials told The Drive in 2018 the company will resurrect the CSL name.
The F82 M4 GTS was even lighter than the CS and boasted more power, with an extra 30kW from its twin-turbocharged inline-six.
The last CSL-badged BMW was the E46 M3 CSL, which was 110kg lighter than the regular M3 and packed extra power and torque.
MORE: BMW M4 news and reviews
