Quote Originally Posted by Hazza555)
Thought so... So to my understanding, R4 is basically N4 but with modified suspension. Is there anything else... I notice that R4 impreza's have bonnet vents similar to that of the old 555's and WRC '97-'00.
Tommi Mäkinen Racing's R4 kit (to TMR spec N4 Impreza)

LIST OF STANDARD R4 UPGRADE PARTS
SUSPENSION ITEMS (BOS R4)
Rear Running gear (Turret)
Top Mount Front
Top Mount Rear
Trailing link
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 *
Rear subframe MTG Kit *

SAFETY ITEMS
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

OTHER ITEMS
Front Heated windscreen (For Spec-C) *
Grill Hood Rh/Lh

* Available on complete kit