I wasn't sure whether to post up here or in the exhaust threads but here goes:

My 06 coupe has the RAS (rear active steering) I know to have an HKS exhaust (just for example) there are two options, one that is for the coupe that doesn't have the RAS and one that does have the RAS.
Does this apply for all exhausts? or can only some exhausts fit the coupe that has RAS, and how can you tell?

any information please let me know, thank you.