IMHO
 

Something like A that mimics the turn signal air ducts up front!

I like option B myself. It's different.

B or hide the outlets by having turn downs tucked behind the bumper. To me, A breaks up the flow of the rear end. I would try to go for a different shape with the outlets on B but it blends in with the flow.

Personally I like to hide the exhaust so I would have to go with B and depending on where your gas tank is this is adding a bunch of exhaust tubing which will create heat.

Well, it looks like wrapping the gas tank with exhaust is about the only way to do exit by the license plate. Decided to un-complicate the exit. In the options with the exits on the outer bumper, the muffler is right in front of it. Well, we will figure out some cool machined tips. I didn't want to have turned down exits facing the ground. It really stirs up the dirt. Eh, its a work in progress. Thanks for all the input!

Machined tail light housings with the exhaust combined....

Getting closer:
3d scanning helps.

That's really cool. It's amazing the technology that's readily available and how it can apply to hot rodding

Taillight design. Based off 61 impala, but with back lit turn signal like the front vents. The lens will be 61 impala.