Do you guys see anything fundamentally wrong with something like this?

There is a shop near my office that builds race cars for various motorsports and I was thinking about having the fab up a bolt-on axle back exhaust to change up the look and sound of my bone stock 01. I would also be getting a new rear valance to match the single outlet as well.

I would most likely be buying a muffler only and having them make the flange and piping to match up to the stock piping.
Can anybody recomend a muffler to use? Any to stay away from?