The straight-piped supermini sounds absolutely bonkers.

Audi has been going back and forth about engineering a hotter A1 based on the supermini’s latest generation to follow the old S1 hot hatch. The tuners at ABT decided to take matters into their own hands and prepared an amped-up version of the stylish city car about a month ago with a bump in output from the series 197 horsepower and 236 pound-feet (320 Newton-meters) to 236 hp and 266 lb-ft (360 Nm).

The tuned A1 Sportback pales in comparison to ABT’s latest one-off creation as this wild subcompact hatch is on the same level of insanity with the ultra-exclusive A1 Quattro limited edition from many moons ago. Side note, the pocket rocket was actually tuned by ABT back in the day and was taken from the stock 256 hp and 258 lb-ft (350 Nm) to 307 hp and 295 lb-ft (400 Nm).

Gallery: Audi A1 Sportback One Of One by ABT Sportsline

This “One of One” A1 packs an even mightier punch as ABT has installed the motorsport-spec 2.0 TFSI engine from the TT Cup race car. Its four-cylinder turbocharged mill produces 310 hp, but there’s an overboost function temporarily squeezing an extra 30 hp for a grand total of 340 hp while torque is over 295 lb-ft (400 Nm) at all times. The German tuner has already fiddled with the engine to take it to around 400 hp, while the brutal soundtrack provided by the four-banger is enhanced by a straight-pipe exhaust system that your neighbors would probably hate.

Sitting close to the road on 19-inch forged aero wheels, the A1 Sportback is 55 millimeters (2.1 inches) wider at the back compared to the donor car thanks to the bulging fenders. The rear doors of the little Audi have been covered, while the back has gained a massive wing and a look-at-me diffuser flanked by the two fat exhaust tips. There’s more to the body kit than the wider hips and new attachments as some of the other panels have been replaced, including the hood and even the door mirror caps.

Regarding the two-tone livery, it’s similar to the black and white RS6+ Avant Phoenix built by ABT for Jon Olsson last year. As a matter of fact, this black and red split theme was actually created by the same talented man. The interior also went through some changes as the rear seats were taken out to make room for a roll cage while the front ones are bespoke body-hugging seats as you’d expect from a proper hot hatch. Loads of Alcantara finishes along with a flat-bottomed steering wheel round off the cabin changes.

There’s still some work that needs to be done, namely suspension tuning and making the final engine adjustments, but everything else has been finalized. Since this is a one-off project, the car is not for sale. Given the amount of work and time invested in the build, it would probably cost an arm and a leg.

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This A1 is a powerful one-off

ABT presents one-of-a-kind A1 in unique polygon split design

An Audi A1 with over 400 hp (294 kW) and 19-inch wheels with aero rings and a leaf shutter look? These mods alone would make an Audi A1 a real head-turner. If you have seen racing driver Daniel Abt’s ‘making-of’ YouTube video, however, you will know that the true highlight has yet to come: the "free-standing" wide body kit with its spectacular racing look. On 26 September at 6 pm, the racing driver and influencer’s final video showing the dynamism of the “A1 1of1”, went live: youtu.be/1biFE9FxNlI.

Aerodynamic attachments are considered standard elements in vehicle finishing, but free-standing widening components provide a unique look in this creative concept. The project, initiated by Daniel Abt, required vehicle tuner ABT Sportsline’s entire gamut of technical expertise. A particular visual effect is created by the unique "polygon split design". The geometric pattern was created by Erik Aleksanjan. He is a real petrol-head and was responsible for the look of the Audi RS6 of extreme skier Jon Olsson. The new design consists of polygonal fragments which really break up the contours of the vehicle. The free-standing widening components are decorated with polygons, which are meticulously arranged in formation, to create a particularly dynamic look.

This is particularly true for the right-hand side of the vehicle, which has remained mostly red. The highlight of the "split design" is the colour transition towards the driver's side. There, matt black dominates, which gives the polygon pattern a subtle appearance. The aggressive racing look is rounded off by the enormous carbon rear wing, the highly fragmented carbon hood with several air intakes and the 19-inch ABT ER-F forged wheels in matt black. With their individually designed and internally mounted golden aero-rings, and leaf shutter aesthetics, the rims evoke high-powered Formula E cars. After all, this is where Daniel Abt is a successful racing driver.

The powerful four-cylinder engine has more than twice the power of the largest standard Audi A1 engine, the 40 TFSI, and creates an awesome sound. This was achieved by installing a completely different 2.0 TFSI engine with performance upgrade. The change of the engine and a sound check can, of course, also be seen on YouTube. The aggressive sound is partly due to the stainless steel exhaust system with twin 114 mm pipes and carbon tails.

In order to further improve performance, the team around Daniel Abt installed H&R suspension springs and Michelin Pilot Sport Cup 2 265/30 R19 red-wall tyres. As befits a real racer, the interior was also enhanced with a roll-over bar and a whole host of additional interesting details. The look and feel of the interior was completely personalised and covered almost entirely with Alcantara. As such, the “A1 1of1” is a fascinating one-of-a-kind masterpiece. If you want to give your A1 40 TFSI more drive and spirit, ABT offers an attractive package: In addition to the performance upgrade from 200 hp to 240 hp (147 kW to 176 kW), ABT suspension springs and 18-inch ABT SPORT GR alloy wheels with 215/40 R18 tyres are also included.