2008-2014 Impreza STI
Struts
Springs
Strut tops and Camber Plates
Camber Bolts
Strut Bars
Coilovers
Swaybars and Swaybar mounts/bushings
Endlinks
Other
Struts + Shocks
Only 2008-2014 STI specific struts and shocks will fit.
2008-2014 regular Impreza struts will not fit up front.
Springs
You should only use 2008-2014 STI specific springs
2008-2014 WRX springs will not work well.
Strut tops and Camber Plates
Only 2008-2014 Impreza specific tops and camber plates will fit.
Rears are 2008-2014 Impreza specific.
Camber bolts
14mm camber bolts up front.
Strut Bars
Only 2008-2014 Impreza specific front and rear strut/shock tower bars will fit.
Coilovers
Only 2008-2014 STI specific coilovers will fit.
2008-2014 regular Impreza coilovers will not fit up front.
Swaybars and Swaybar mounts/bushings
Not sure on turbo/non-turbo front swaybar compatibility. Probably are not interchangeable though.
Only 2008-2014 Impreza specific front and rear swaybars will fit.
Not sure on WRX and STI compatibility.
Endlinks
Not sure on front compatibility.
Only 2008-2014 Impreza specific rear endlinks will fit.
Other
Not sure on sedan and wagon differences yet.
Please help me update this section as info becomes available!