MK4 Focus ST BC Racing Coilovers - BR Series S5 (B10) where on other systems a

where on other systems a lesser quality mild steel is sometimes used

Venom Back Box Delete Race Cat/GPF-Back - The most extreme upgrade that retains the factory catalyst and GPF for those that want to stand out from the crowd

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MK4 Focus ST BC Racing Coilovers - BR Series S5 (B10) where on other systems aThis is the kit we recommend for the best balance of performance and comfort, designed by the factory to have the best overall compromise of spring rate, ride height range, top mount design and damping rate to suit the majority of car owners. It is more than capable of dealing with fast road and track work but also retains a high degree ride civility so the car can still be used for mundane duties and long journeys without the ride becoming tiring.