Exhaust System on Stock 273

Again, I don't want the headers because I really want the least amount of down time and don't really want to spend that much. Honestly, $200-300 for an exhaust does not sound bad at all, no pun intended. A pair of Dynomax run at about $90 on Summit. If I do this, should I get a 2.25" system? I'd think the 2.5" would be a little bit overkill for a stock 273 unless I upgrade to a 360 later.

I really don't know what this exhaust is, if it's from the factory but somebody put a huge dimple in it to clear the T-bar. I was able to fit about 2-3 fingers across most the way and if the exhaust wasn't dimpled I could probably fit a finger or so.