Brintech Customs converted this 2012 BMW 135i into a 1M at their company in Seven Hills, NSW, Australia. The car originally came with a turbocharged N55 inline-six however they swapped it for a 4.0 L S65 V8 from a E92 M3. The factory-spec motor produces 414 horsepower and 295 lb-ft (400 Nm) of torque. Brintech Customs carried over the rest of the E92 M3 drivetrain including the front and rear subframes. This means power is sent to the wide 295/30/19 rear tires through a seven-speed dual-clutch transmission (DCT) and 210 mm limited-slip differential. The finishing touch to the project is a full 1M body kit.
Source: Brintech Customs (project page)
Somebody should build these in the USA for a reasonable price-say $50k, and they would sell a boatload of them.