You're dead right, one thing that really takes away from the back of the car is the tips. I was thinking of getting some 2.5/3" stainless steel tips put on. Just cut the old ones off and weld the new ones on. Don't even think I'm bothered getting an exhaust.
4" dual would be class! When you looking to get it done?
But defo go at least 3''. I would say 3.5'' minimum as you would eventually want to go bigger if you got 3''.
Im hopefully getting it done next week but of course will update everyone. 4'' will fill the valance cavity nicely.