This German tuner's made a 323kph Mercedes A-Class

By topgear, 29 April 2020

The Mercedes-AMG A45 S is the most powerful hot hatch in series production. It has 415bhp and does 0-100kph in 3.9secs. Absurd – some might say pointless – pace for a five-door, five-seat car.

But not absurd or pointless enough for some. The A45 has been a tuning magnet thus far, with Renntech and RaceChip both giving it yet more power.

And now it’s Posaidon’s turn. The German tuner has launched a two-tier upgrade for the A45. The first focuses on the stock 2.0-litre turbo’s software, and frees up another 50bhp for a 465bhp peak and a 3.6sec 0-100kph time. Enough.

Or not. The second tier of its tuning – dubbed the RS 525 – swaps out Merc’s apparently insufficient turbo for a much beefier one, yielding a 525bhp peak and a 3.4sec 0-100kph time. But those figures pale in insignificance to its new top speed: 201mph – which equates to 323kph. Y’know, as in as fast as a V10 Audi R8. Or a Ferrari F40…

That’s not even the maddest bit. Over to Posaidon: “An even more powerful ‘plus’ model is currently in the development phase, though Posaidon is giving nothing away at present about its potential performance.”

Yep. Posaidon not only thinks a 323kph Mercedes A-Class isn’t quite enough, but it also talks about itself in the third person. Yikes.

Luckily, it’s seen sense elsewhere and is also prepping other upgrades for the A45 – most usefully a ‘high-performance braking system’, thank the lord – while it also says these upgrades will be suitable for any member of the 45 family. Meaning you can have a 200mph (322kph)-plus saloon, estate or SUV too if the CLA or GLA is your tiny mad AMG of choice…