Because Race Cars Don't Need Turn Signals. (F30 BMW 335i Race Car Gallery)

March 31 2012 will be the debut of 2 new F30 BMW 335i race cars in South Africa. These car are prepared by ADF Motorsport at the Kyalami Race Track.  They will be participating in the WesBank Super Series and the 2012 24 Hours Nurburgring race. (Race Cars don't need turn Signals, Huge Gallery Inside!)

Specifications
2,998 pounds (1360kg)
408hp / 443 lb-ft torque (600nm)
MoTeC ECU
Turbos boost lowered to maximum 0.7 bar and 40mm turbo inlet restrictor
M Performance front brakes (370mm)
18" BBS wheels
Akrapovic exhaust
GPS data logging system
6 weeks to complete, at cost of about 259,900 CAD

 Source : F30 Post