Yellowfever, It is an autoform spoiler...i believe it's only rated at 165 mph or so (funny b/c I've been 180+ in the car), (4 bolt attachment) but it is the best spoiler to keep your car "virgin" b/c there's no drilling (4 rivet holes on the sides of the lid) It can be taken off and you would never know it was mounted...I'll send one "before picture"