Bumper can stay on. Ive removed them with and without removing it. The two lower bolts near the sill will shear off, and you'll have to drill holes through and use a nut and bolt when refitting, unless you're really careful. There's a bolt hidden above the door hinge also. Remove the headlight first then the wheel arch plastic cover. The bumper is clipped into a plastic piece bolted onto the front wing at the side. Take off indicator and remove rest of bolts. Tadaa.