...unnecessary, unless you spend excessive time above 120 or so? We all know mom's Corolla with a 1' spoiler is stupid, but how fast would little Rick have to get it before he could justify it?
(No, I'm not asking so I can slap a wing on my Mustang. She tries breaking 95 and the windows start shaking like a polaroid. BANG BANG is not a good sound next to my ear)