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Best Focus ST mods for beginners

Easiest and cheapest first.

ModGainCostDifficultyTime
Spark plugsRestores lost power$40–$60Easy30–45 min
Cold air intake+5–12 whp$300–$350Easy1 hr
ECU tune (COBB Accessport)+20–35 whp$600–$700Easy45–60 min
Rear motor mountLess wheel hop$190–$200Medium1–1.5 hrs
Brake pads + fluidLess dust + fade$300–$330Medium2–3 hrs
Cat-back exhaust+3–8 whp$680–$760Medium1.5–2 hrs
Front-mount intercooler+5–15 whp$1,000–$1,200Hard3–4 hrs
CoiloversHandling + stance$1,090–$1,200Hard3–5 hrs

HP numbers are wheel-horsepower estimates.