i don't think you have to, but i would recommend that you do, i have 18"'s and eibach pro kit and it's pretty close to the fender. check it out. http://community.webshots.com/user/bigdaddy181
2000 CSVT #531/2150 black/tan 18" Racing Hart M5 Eibach pro kit Mirko spltter custom dual exhaust Momo shifter Momo Touring pedals pre-98 sails cleared out headlights etc.... "big pimpin never slippin" MY BABY! http://community.webshots.com/user/bigdaddy181