M135i is likely to be powered by a 16bhp turbocharged 3.0-litre straight-six engine

These spy pictures show the most potent version of the new BMW 1-series, which is set to launch alongside the new three-door model later this year.

A BMW M insider confirmed to Autocar that the new model was likely to wear the M135i badge and would be part of the firm’s upcoming M Performance Automobiles line-up.

See pictures of the new BMW M135i

According to the insider the M135i model, pictured here in testing for the first time, was likely to be powered by the same 316bhp turbocharged 3.0-litre straight-six engine found in the BMW 640i.

Like all M Performance models, the M135i will also sport a whole host of chassis and styling tweaks as part of its makeover. Insiders say the model should be viewed as a three-door hatchback version of the current 135i coupé, with a more focused M-honed chassis and more muscular styling.

The spy pictures also reveal the look of the three-door 1-series for the first time. It gets a gently sloping roofline and a more angular rear glasshouse for a sleeker profile than the five-door model.

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