Dual for sure. I like mine, it never gets looked at by the local law enforcement. They have cracked down hard here on "enlarged/modified exhaust". Mine looks stock, makes very little noise under normal driving conditions, but delivers a satisfying roar under boost. :smokes:
It's not an Aussie, but a Fujitsubo, but I like it's low key style. No use attracting any more attention that I already do.