What is it?
The standard Ford Focus RS is a masterclass in imperfect perfection. It warranted a five-star road test, despite the fact that a Volkswagen Golf R is better everyday, simply because when the RS is in its element, it rather redefines what you'd expect of a hot hatch. We love it, flaws and all. At which point it becomes harder than ever to believe that a Mountune intervention can improve things.
Still, this upgrade - officially dubbed the Ford Performance by Mountune upgrade or FPM375 - is a collaboration between the well-known tuning arm and Ford itself, meaning that you can have the extra 25bhp and 30lb ft and still keep your warranty. It's also only £899, so the appeal is obvious, despite the brilliance of the standard car. The kit as a whole includes a re-flashed ECU, high-performance air filter, bespoke crossover duct and upgraded air re-circulation valve (or what many of us would know as a dump valve).