The plan was to go with 5, but when I went to pick the car up the installer had chosen to not install them because he thought they would rub with my Signature Wheels. After talking to Jamie at Signature and the guys at N2itive, the installer seemed to be the only one who thought rubbing would be an issue, but I never made the time to go back and have them installed. I'll be switching back from the Arachnid's to my SW's next month and will probably move forward with putting the links on at that time. Believe N2itive recommended minimum of -5 to avoid the dreaded 30-50mph "shudder" issue.