BMW 320d,
woken right up.

BMW builds the 320d to be effortless, then quietly makes it a bit less effortless than it could be. That N47 or B47 diesel is detuned from the factory — one softened map that has to keep every 320d happy, from a pampered garaged E90 to an F30 that lives on a motorway hard shoulder in the rain. The result is a genuinely good engine that's been told to calm down.

Un-tell it a little and the 320d does what it always wanted to. A remap pours torque into the mid-range, so overtakes stop being a project and turn into a squeeze of the throttle — and because you're leaning on it less to get the same shove, a gentle right foot can claw back a bit of diesel at the pump. We do the whole thing mobile: we turn up wherever you are and connect proper dealer-level kit on a stable power supply, none of this eBay-cable-and-a-prayer business.

We back up your factory file first, so the map's fully reversible if you ever want stock again. The DPF, EGR and AdBlue stay put and road-legal — we're tuning the car, not gutting it. Real gains vary with year, spec, fuel and condition, so we'll give you an honest estimate rather than a number we made up to look good.