I disagree with the wank factor others have suggested. I don't have a quad exhaust on my car although I have contemplated it quite a few times. A quad exhaust fitted to any Falcon, whether it's a six or an eight is done because people like the look of it. If you like the look of a quad exhaust, then get it. I would do that before I started sticking GT bodykits, etc on the car. And hey, if a quad exhaust is good enough for a BMW E46 M3 straight six, then it's good enough for me.