Roads with mandatory chain controls require a tire with the snowflake symbol instead of m+s in many states. It would be wise to do some checking with the local department of transportation. The z6 chains are some of the lowest clearance available I've been able to find. I have some for my '12 wrx, but haven't needed to use them due to snowflake tires. They appear to have no clearance issues after dry fitting, but if the manual says no chains...it could be a bit of an expensive repair gamble. I decided to have them, and if I end up on a road closed except for chains only, I have options. From my dry fit test, I would very likely use them if needed.