Even if the current Ford Focus RS is the craziest hot-hatch out there, Mountune decided to offer it a bit more juice. Together with Ford Performance division, the approved upgrade boosts peak power from the Ford 2.3‑litre EcoBoost engine by 25 hp to 375 hp and peak torque by 40 Nm to 510 Nm using overboost.

Equipped with the Ford Performance by Mountune power upgrade that is available in selected European markets and priced £899 for customers in the U.K., the Ford Focus RS achieves improved 0-62 mph acceleration in 4.5 seconds

How fast is that? Faster than a Porsche 911 Carrera with manual transmission costing more than double the Focus RS list price. Top speed remains 165 mph.

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The Ford Performance by Mountune kit for Focus RS includes a high-performance air filter, bespoke alloy crossover duct with high-performance silicone hoses, an upgraded air re-circulation valve and revised software tuning for the engine ECU.

Any Mountune-appointed Ford dealer will be able to fit the upgrade in 1.5 hours and it is fully compatible with the Ford warranty, meaning Ford Performance by Mountune Focus RS vehicles continue to be covered against mechanical failure. For example for three years or 60,000 miles in the U.K. from the original date of purchase.

Ford has received more than 4,600 UK orders for the Focus RS since last September, so you can consider it a real hit.