![mTune SMARTflash m235 Upgrade [Mk8/8.5 Fiesta ST] Bolts misfires and rough idle](https://cdn.shopify.com/s/files/1/0367/2621/files/smartflash_m235_new_2048x_5b8bd495-65fa-4bf7-b790-a7c06cd872f1.webp?v=1748718059)
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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1
misfires and rough idle
reliability and safety demanded
TUV approved
delivering a sporty yet refined exhaust note
m200 performance
mTune SMARTflash m235 Upgrade [Mk8/8.5 Fiesta ST] Bolts misfires and rough idleThe mountune m235 power upgrade for the Mk8 Fiesta ST provides a substantial uplift in the performance from the ST's 1. 5 litre 3 cylinder EcoBoost engine, safely raising power and torque output; improving performance and drivability, whilst adding a host of functionality, unique to mountune. As with all mountune upgrades, it's had to pass our own stringent durability testing criteria, which included additional months of in cylinder pressure
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