https://www.bmwblog.com/2013/04/13/european-auto-source-ads-wew-ess-vt2-525-supercharger-for-z4m/
European Auto Source adds new ESS VT2-525 Supercharger for Z4M
Apr 15, 2013 - California-based tuner European Auto Source upgrades a BMW Z4 M with a new supercharger. The VT2-525 supercharger system is the latest kit released by ESS
european auto sourceaddsnew
https://www.bmwblog.com/2016/07/25/ac-schnitzer-acs4-build-european-auto-source/
AC Schnitzer ACS4 build by European Auto Source
Jul 25, 2016 - California-based European Auto Source teamed up with German powerhouse AC Schnitzer, and other aftermarket companies, to tune up a BMW M4.
ac schnitzerbuildeuropeanautosource