WITH! If i bought an SVT right now, i'd put a spoiler on it if it didn't have one! It just makes it look that much more aggressive. You ever see the mustangs without the spoiler? They look like they're injured and all limping around on the road. The spoiler just completes it. As for those racing ones. Eeeeeech. Why have a big honking chunk of metal on the back of your car? It's not like we have rear wheel drive, or all wheel drive for that matter. That makes it look crazy ricey AND ugly.
