Engine tuning can produce wonderful results, especially when it’s applied to an unassuming vehicle like a run-of-the-mill city car. With some smart mods and a bit of bravery, a boring hatchback can be transformed into the ultimate sleeper. And that’s exactly what happened with the Volkswagen Polo presented in the video embedded at the top of this page.

Published on the CCD Video YouTube channel, the 8-minute production shows how the humble 1.9-litre turbodiesel engine can put to shame stock cars that are more than 10 times more expensive than a Polo, which starts at around €20,830 in Germany.

Granted, it’s far from stock, with upgraded injectors and cam, a bigger turbocharger, as well as larger pipes for the intake and exhaust. The sub-assembly is still stock, but the blacked-out Polo also has a huge surprise lurking: nitrous oxide.

The first dyno run was made with the boost from the turbocharger only, and the 1.9-litre TDI made 366 bhp with around 2.8 bar of pressure from the hybrid turbo.

Then, with nitrous involved in the mix, the car put down 472 bhp. But that’s not all because a couple of dyno runs later, the pint-sized Polo managed to squeeze out an impressive 513 bhp from its tiny diesel engine, albeit highly modified.

That’s more powerful than a base Porsche 911 that makes 379 bhp from its twin-turbocharged 3.0-litre flat-six engine. It’s also more powerful than a Dodge Charger Scat Pack, which has a 485 bhp 6.4-litre V8 under the bonnet.

Furthermore, the interior of the city car is more or less stripped, so there’s some weight reduction going on there, making it a super sleeper that will probably beat a lot of cars that are substantially more expensive than the humble Polo.