Video: 390bhp BMW M135i versus M2

Video: 390bhp BMW M135i versus M2 Two hot BMWs, one modified, another as it left the factory. Which is better?

Over the last eight months we've been modifying a BMW M135i - it's now faster and more powerful than an M2.

In this video we explain exactly what work we've done to the M135i, then answer the big question: how does it compare to BMW's own baby M-car?

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