R4-kit is a FIA-approved upgrade to existing Group N Subaru Impreza WRX STi rally cars. R4-kit increases car performance by the geometry changes and weight reduction.
Japanese Subaru Technica International (STi) has developed and homologated a R4-kit for Subaru Impreza WRX STi N14 and N15 rally cars. The R4-kit increases the competitiveness of the group-N Subaru Impreza WRX STi compared to Super2000 cars.
R4-kit further improves on the already fast group-N Subaru Impreza WRX STi´s performance and reliability. For example it reduces the car's weight by approximately 50 kilograms, has stronger lower bottom arms with uniball and also increases the car's suspension travel for smoother and accurate functionality.
Possum Bourne Motorsport strongly believes R4-kit will improve your rally results.
We can supply individual parts or a Complete upgrade Kit.
LIST OF STANDARD R4 UPGRADE PARTS
SUSPENSION ITEMS (BOS R4)
Rear Running gear (Turret)
Top Mount Front
Top Mount Rear
Pillow Ball Bush Front for Trailing link
Pillow Ball Bush Rear for Trailing link
Rear lateral link Assy Front
Pillow Ball Bush for Rear Lateral Link Front
Rear lateral link Assy Rear
Pillow Ball Bush for Rear Lateral Link Rear
Pillow Ball Bush for Rear Upper Arm Front
Pillow Ball Bush for Rear Upper Arm Rear
Stabi link Front
Stabi link Rear
Ball Joint for Front Lower Arm
Front Cross Member / Reinforcement kit
Front Cross Member MTG Kit
Pillow Ball Bush Front for Front Lower Arm
Pillow Ball Bush Rear for Front Lower Arm
Rear subframe MTG Kit
Front Doors Impact-Form Rh/Lh
Rear Doors Impact-Form Rh/Lh
Head Protection Form Rh/Lh
Front Door Carbon Trim Rh/Lh
Rear Door Carbon Trim Rh/Lh
WEIGHT SAVING ITEMS
Front Door Windscreen Rh/Lh
Rear Door Windscreen Rh/Lh
Rear Gate Windscreen
Heater and Demister
Front Heated windscreen (For Spec-C)
Grill Hood Rh/Lh
For further information on R4 kit please contact us