Settle into the low-slung driver’s seat and your view ahead is both familiar and different. The dashboard architecture is all Impreza, but there’s a TFT digital dial pack nestled within the instrument binnacle, a large column-mounted paddle shifter and a gorgeous, suede-wrapped three-spoke steering wheel.
Flick a small switch on the centre console to prime the ignition, thumb the starter and the boxer bursts into life, settling to a buzzing, rasping idle.
The clutch is electronically actuated, so there’s no way to feel the biting point, but once you’re moving, you can ignore the left pedal altogether as you simply pull or push the paddle for your next upshift or downshift.
That said, the transmission requires some coaxing to get the best out of it. Straight-cut gears mean the system is constantly whining, gnashing and chuntering away, and if you forget to keep it loaded with a little throttle during upshifts, you will be treated to epic driveline shunt and a noise like a mouse farting. Learn to work with it, however, and the changes through the short, closely stacked ratios are quick and near-seamless – a perfect combination for an engine that delivers ferocious and vocal progress.
In the default Road driving mode, there’s a little less than 400bhp and response that’s sharp rather than electrifying. Select Sport or Sport Plus and you get the full 450bhp and a rabidly savage riposte to the smallest flex of your right foot.
You want more? In the latter mode, you can access the anti-lag system, which keeps the turbo spinning off-throttle by injecting fuel to flame-spitting, shotgun-blasting effect – although for the sake of your frazzled senses, you will want to use it sparingly.
In either of those modes, the P25’s pace is eye-widening, its trick four-wheel drive system ensuring that every last horsepower is translated into slingshot acceleration, the searing pace accompanied by a crackling, saw-toothed sonic backdrop familiar to anyone who has spent time stage-side at Sweet Lamb or St Gwynno.
So quick is the P25 down the straights that your first stab of the brakes is likely to be a heart-in-mouth moment, the unassisted AP Racing system requiring thigh-bursting pressure to achieve meaningful retardation. Once you’ve got used to the physicality required, though, the anchors deliver tireless power and perfect progression.