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Ford Focus ST225 Performance Parts & Upgrades

Upgrade your MK2 Ford Focus ST225 with performance parts from leading brands, including AIRTEC, Cobra, SuperPro, Forge Motorsport and Genuine Ford.

Browse induction kits, intercoolers, exhaust systems, suspension upgrades, brake components, clutches, engine mounts and servicing parts designed for the 2.5-litre turbocharged Focus ST.

Not sure where to begin? Read our Focus ST225 tuning guide for advice on the most effective upgrades, common problems and recommended modifications for different power goals.

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  • Front Splitter Ford Focus Ii St Preface Model - Wayside Performance Front Splitter Ford Focus Ii St Preface Model - Wayside Performance
    MAXTON® DESIGN

    Maxton Design Front Splitter Ford Focus Ii St Preface Model

    £174.00
    £174.00
  • Side Skirts Diffusers Ford Focus St Mk2 - Wayside Performance Side Skirts Diffusers Ford Focus St Mk2 - Wayside Performance
    MAXTON® DESIGN

    Maxton Design Side Skirts Diffusers Ford Focus St Mk2

    £174.00
    £174.00
  • Rear Side Splitters Ford Focus Mk2 St Preface Model - Wayside Performance Rear Side Splitters Ford Focus Mk2 St Preface Model - Wayside Performance
    MAXTON® DESIGN

    Maxton Design Rear Side Splitters Ford Focus Mk2 St Preface Model

    £79.00
    £79.00
  • Bonnet Add-on Ford Focus Mk2 Pre-face - Wayside Performance Bonnet Add-on Ford Focus Mk2 Pre-face - Wayside Performance
    MAXTON® DESIGN

    Maxton Design Bonnet Add-on Ford Focus Mk2 Pre-face

    £69.00
    £69.00
  • Rear Valance Extension Ford Focus Mk2 St (Preface) - Wayside Performance Rear Valance Extension Ford Focus Mk2 St (Preface) - Wayside Performance
    MAXTON® DESIGN

    Maxton Design Rear Valance Extension Ford Focus Mk2 St (Preface)

    £59.00
    £59.00
  • Rear Side Splitters V.1 Ford Focus Ii St Facelift - Wayside Performance Rear Side Splitters V.1 Ford Focus Ii St Facelift - Wayside Performance
    MAXTON® DESIGN

    Maxton Design Rear Side Splitters V.1 Ford Focus Ii St Facelift

    £79.00
    £79.00
  • MK2 Ford Focus ST ST225 & RS 2.5L Genuine Thermostat Housing - Wayside Performance
    Genuine Ford

    MK2 Ford Focus ST ST225 & RS 2.5L Genuine Thermostat Housing

    £249.99
    £249.99
  • RTS Performance Brake Discs – Ford Focus ST225 (MK2), Volvo V50 T5 – 320mm – Front Fitment (RTSBD-7225F) - Wayside Performance
    RTS Performance

    RTS Performance Front Brake Discs – MK2 Focus ST ST225 & Volvo C30/C70/S40/V50 – 320mm

    £139.00
    £139.00
    £199.99
  • Airtec Aluminium Radiator Upgrade for Focus Mk2 St and Rs - Wayside Performance Airtec Aluminium Radiator Upgrade for Focus Mk2 St and Rs - Wayside Performance
    AIRTEC Motorsport

    Airtec Aluminium Radiator Upgrade for Focus Mk2 St and Rs

    £631.76
    £631.76
  • Airtec Motorsport Power Steering Tank for Focus Mk2 – With Sight Glass and Cap - Wayside Performance Airtec Motorsport Power Steering Tank for Focus Mk2 – With Sight Glass and Cap - Wayside Performance
    AIRTEC Motorsport

    Airtec Motorsport Power Steering Tank for Focus Mk2 – With Sight Glass and Cap

    £153.10
    £153.10
  • Airtec Motorsport Remote Oil Cooler Adaptor Plate for MK2 MK2 Focus ST225 & Rs - Wayside Performance Airtec Motorsport Remote Oil Cooler Adaptor Plate for MK2 MK2 Focus ST225 & Rs - Wayside Performance
    AIRTEC Motorsport

    Airtec Motorsport Remote Oil Cooler Adaptor Plate for MK2 MK2 Focus ST225 & Rs

    From £133.95
    From £133.95
  • Airtec Motorsport Oil Breather Top Plate for Focus Mk2 St & Rs - Wayside Performance Airtec Motorsport Oil Breather Top Plate for Focus Mk2 St & Rs - Wayside Performance
    AIRTEC Motorsport

    Airtec Motorsport Oil Breather Top Plate for Focus Mk2 St & Rs

    £167.45
    £167.45

Choosing upgrades for your Focus ST225

The best upgrades for your MK2 Focus ST225 depend on its current condition, intended use and power target.

For most tuned road cars, the priority is ensuring the vehicle is mechanically healthy before improving airflow and cooling with a suitable induction kit, intercooler and exhaust system.

The standard clutch can also become a limiting factor as torque increases, while suspension bushes and control arms are common wear points that can significantly affect how the car drives.

Our dedicated collections contain detailed recommendations for each upgrade category, including which products suit Stage 1, Stage 2, higher-powered and track-driven cars.

For complete staged tuning advice, read our Focus ST225 tuning guide.

Why buy Focus ST225 parts from Wayside Performance?

We supply parts that we regularly fit, test and tune on Focus ST225s. This allows us to recommend components based on real-world fitment, performance and drivability rather than relying solely on manufacturer descriptions.

Contact us if you need help choosing compatible parts or planning the next stage of your build.