What I need to know if the rear swaybar and rear brake setup from an EK9 fit's a 4 saloon without modification?
Of course will the front won't be such a problem,but I dunno what about the rear...
SWAYBAR As for it "fitting" - yes it does. BUT if you want the ARB you really need a subframe brace fitted as well or you risk tearing the subframe mounting points.
ASR and Function 7 make them; piccy of mine fitted.
BRAKES
If you have done a 5 stud hub conversion then yes, no worries. Providing of course you already have rear discs otherwise handbrake cables are different, you'll need those from an appropriate rear disc saloon/coupe.
If you are still 4 stud then the calipers/carriers wil fit but you would need to redrill the discs to 4x100 or find suitable fitting replacements.