We’ve all missed AC Schnitzer’s radical creations, but the tuner has an ace up its sleeve reserved for the Essen Tuning Show.

Although it looks like a slightly-modified 1 Series, this little tot hides – and there’s no easy way of saying it – a modified tri-trurbocharged, 3.0-litre, inline-six powerplant taken from the 5-Series M50d under its hood.

Named the ACS1 5.0d / 150d to underline its little secret, the 1 Series chugs out 394 HP and 800 Nm torque form the diesel-powered beast, making it accelerate from from 0-100 km/h in just 4.5 seconds, while AC Schnitzer points out that the acceleration from 80 to180 km/h happens in only 7.9 seconds.

But worry not, because if you don’t want to overkill your 1 Series with a monster-diesel engine cramped within its bowels, the tuner is willing to offer its expertise and knowledge on virtually any powertrain available for the small BMW – creating a wide array of beasts in the process, modifying the minute 114i all the way to the potent 135i.

The power range can vary from 151 HP to 375 HP, in order to satisfy every demand, and the AC Schnitzer-signed kit emphasizes the model’s new power infusion. In fact, AC Schnitzer says that the improved package offers driving fun and maximum “cornering comfort” , thanks to the fully-adjustable racing suspension and new exhaust system (along with the power upgrades, of course).

Styling-wise, the 1 Series can sit on a choice of humongous wheels (varying from 19″ and 20″) and boasts the usual BMW M-Technik kit mated to AC Schnitzer’s own personal touch. So, expect two-piece front spoiler elements, chromed front grille on the export variant, and rear roof wing.

Completing the overall look, you’ll find the AC Schnitzer desiged interior, garnished with – among other things – aluminum cover for the “i-Drive” system controller, AC Schnitzer keyholder, a gear knob with digital gear display and the “Black Line” aluminum gear knob or a leather gear knob optionally available with illumination.

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