Cat Back Exhaust [Mk7 Fiesta ST] Pistons which the Stage 1 calibration

which the Stage 1 calibration has been fully optimised for

39% increase in air flow

Each set is supplied pre-gapped by mountune to optimise the setting and allow for easier end-user installation

Direct replacement

Cat Back Exhaust [Mk7 Fiesta ST] Pistons which the Stage 1 calibrationThe mountune Cat Back Exhaust for mk7 Fiesta ST reduces back pressure and improves performance, whilst keeping cabin intrusion boom to a minimum. Designed and developed in the UK, mountune's cat back exhaust utilises a Helmholtz chamber design in the rear silencer. This helps cancel out unwanted frequencies due to the way in which the exhaust gas waves are reflected. Despite being more complicated and therefore expensive to manufacture, this design