BMW M5 CS in the works?

The first-ever M5 CS could boast 640 horsepower.

BMW is working on a more hardcore variant of the M5 worthy of wearing the coveted CS nameplate, according to a recent report. The first-ever M5 CS could arrive in showrooms before the end of 2019.

German website Auto Zeitung spotted what looks like a CS prototype testing on a race track in Germany. The super-sedan wears a bigger rear spoiler similar to the one fitted to the CS variants of the M3 and the M4; that's the biggest indication that we're not looking at a run-of-the-mill M5. The spoiler is made out of carbon fiber in order to keep weight in check.

The rest of the car looks unchanged, though the production variant could receive other add-ons. Auto Zeitung speculates BMW could shave 88 pounds from the M5 by adding more composite parts and sending most of the sound-deadening material back to the parts bin. Chassis and steering modifications will also be part of the transformation.

The CS will keep the standard M5's twin-turbocharged, 4.4-liter V8 engine but it will deliver more power. 640 horsepower is possible, a 23-horsepower bump compared to the Competition Package-equipped M5. The standard M5's V8 makes 600 horsepower.

BMW hasn't commented on the report. If it's accurate, we could see the M5 CS make its debut in the next few months and land in showrooms during the first half of 2019.

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