European Auto Source is one of the go-to BMW tuning houses in California and its latest project was for a black-on-black E93 M3. First up, the drop-top's V8 engine was bored and stroked out from 4.0 to 4.6 liters, not doubt upping the output from 414 hp and 295lb-ft of torque to something considerably higher. A Dinan stage 3 suspension, big brake kit and high-performance exhaust was then fitted to handle the extra power, while the convertible's performance was further enhanced with a new set of 19-inch alloy wheels.

These come courtesy of BBS, whose LM-R wheels are finished in Diamond Black with Diamond Cut rims. Completing the transformation is a set of glossy carbon-fiber trim pieces to complement the black leather interior.