You have to drill holes in the strut tower, it is obvious where when you get a bar. Neuspeed bars are originally supplied with nutserts so that you can remove and reinstall the bar. Problem is, after a few time of removing and installing the bar for whatever maintenance issues, the nutsert and/or bolt threads get pretty messed up. I ended up just bolting the bar into the holes with a nut from inside the wheel well, it's a little tight clearance wise, but can be done. Plus I think it's actually a stronger attachment.