The ST’s 2.5-liter engine can be promoted from 225bhp to 260bhp with the Mountune kit, producing torsion to 295lb-ft and making for the 0-60mph time down to 5.9 seconds.
The kit contains a bigger inter cooler, a high-flow air percolate and retooled engine standardization. It can be accommodated at specialist Ford dealers and costs £1,120 plus labour; its addition does not influence Ford’s warranty.

Mountune Performance has previously formulated a standardized kit for the outgoing Fiesta ST and has been doing work with Ford Team RS. A pause upgrade kit is now also under production and additional Moutune Performance packs will be obtainable for other Ford models later this year.