The Focus RS is the most underrated performance platform Ford has built in the last decade. A turbocharged 2.3L EcoBoost making 350hp from the factory, all-wheel drive with a drift mode that actually works, and a chassis that was developed on the Nürburgring. These things came ready to fight cars costing twice as much — and with the right build order, they get genuinely scary fast. But too many people throw parts at these in the wrong sequence and end up chasing problems instead of power. We broke down the smart way to build one: → Which bolt-ons give you real gains on day one (and which are a waste) → Why your tune and intercooler order matters more than you think → The suspension setup that doesn't destroy your daily driveability → Why 18x9.5 is the fitment sweet spot for this car → Where this platform actually sits in the performance hierarchy The RS responds incredibly well to modifications when you do them in the right order. Get it wrong and you're fighting head gasket issues...