The most noticeable problem is mounting it to the center pillar of the bumper. Some people have drilled holes and used screws to hold it in place. I know flip used a dremel and shaved a little of the material on the actual SD air dam to have it sit flush on the bumper and used 3M tape to hold it on.
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99 Grand Prix GT ER Rockers|HV3|HV TB|Borla Catback|Black Koblenz|GMPP Lowering|GMPP Handling
www.fquick.com/The_Guz