Mounting pressure from enthusiasts has helped lead Ford Australia to officially offer Mountune Performance modifications with warranty support for Fiesta and Focus ST.

Available in Europe for some time on both Sport Technologies hot-hatchbacks, the dealer-fitted performance-enhancing hardware boosts power and torque for both considerably.

The $25,990 Fiesta ST moves from 134kW to 158kW at 6000rpm, and from 240Nm to a Polo GTI-matching 320Nm at 3000rpm, for a recommended retail price of $2328 extra.

Focus ST driving

MOTOR has previously achieved 0-100km/h acceleration times of 6.97 seconds for the smaller three-door ST and 6.4sec for the larger five-door ST, so expect solid improvements for both.

Focus ST Mountune performance kits

Both Fords include Mountune Performance badging and revised engine calibration, although the Fiesta ST only adds a new porous lower feed hose, custom aluminium high-flow airbox with dual cold air feeds and high-flow panel air filter. The Focus ST gets a large-capacity alloy intercooler, cast crossover duct and dual-entry air filter.

Fiesta ST driving
Fiesta ST Mountune performance kits

MOTOR has tested a similar Mountune performance kit on the Fiesta ST added privately by Herrod Motorsport here.