BMW M secretly built an M5-engined E46 M3 CSL, and this is it

For 50 years this family saloon has been BMW's best-kept secret

These BMW M Prototypes Have Been Kept Secret For Years

This is the one-off 550bhp secret BMW M5 CSL

Top secret: The BMW M CSL prototypes

BMW M shows off CSL prototypes - Autoblog

Top secret: The BMW M CSL prototypes

Delightful Dozen 12 Favorite M Cars from 50 Years of BMW M GmbH

Top secret: The BMW M CSL prototypes

Roundel Reprint: BMW E39 M5 Review (1999) - BimmerLife

E46 M3 CSL + Manual: The Best BMW of All Time?

As BMW unveils the M4 CSL we take a look at what CSL means to BMW.

M3 CSL: The search for BMW's M car pinnacle ends here

Take a Look at the BMW M2 CSL That Never Was

BMW E46 M3 With An M5 V10 Sounds Like An M-Car Match Made In Heaven

BMW M secretly built an M5-engined E46 M3 CSL, and this is it, e46