/6 single or dual exhaust?

Too big a pipe (dual 2 1/2") won't dry out as fast when driving. It will rust out fast.

Will probably hurt MPG's. I did stock sized pipe into duals for my Duster through dual generic round turbo mufflers. Nice rumble at idle quiet on the highway out the rear. it had a drone under 70 mph.

I now have headers with the same system with a cross over H pipe to quiet it.