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Best E46 mods for beginners

Easiest and cheapest first.

ModGainCostDifficultyTime
Spark plugs + ignition coilsRestores lost power$60–$350Easy1 hr
Cold air intake+5–12 whp$300–$1,070Easy1 hr
Brake pads + fluidFirmer pedal$180–$300Medium2–3 hrs
Sway barsLess body roll$650–$850Medium2–3 hrs
Cat-back exhaust+3–8 whp$1,000–$2,000Medium2–3 hrs
Cooling system overhaulProtects the engine$300–$1,100Hard4–6 hrs
CoiloversHandling + stance$1,100–$1,400Hard5–7 hrs
Rear subframe reinforcementPrevents floor cracks$150–$2,500ExpertShop job (1–2 days)

HP numbers are wheel-horsepower estimates.