In order to fit our 18X11.5 with 335/30/18 wheel & tire package on your Z06, you will need to remove the brake duct hose. Pictured is the only bolt holding this duct on, it is easily removable in less than 1 minute. THIS IS THE INTERIOR DUCT INSIDE THE WHEEL WELL; YOU DO NOT NEED TO REMOVE THE EXTERIOR BRAKE DUCT THAT DISTINCTS THE Z06!