I see this as a possible Concept

“There always must be space for improvement,” is the only answer we could coax from 1-series project leader Gerd Schuster about the probability of a high-performance M1 version of the 1-series. But we have reason to believe an M1 is in the works with a twin-turbo four-cylinder. It won’t necessarily have more horsepower than the 135i, but with sharper reactions and a lighter body and engine, the M1 would clearly be king of the compact-car segment.

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My dream scenario

Highreeving (+8000 rpm)
330-350 hp
- 100 kg less than standard 135i
Very wide fenders