Exhaust system for '66 GMC 305E V6

[athan66]

I'm seriously thinking about upgrading the exhaust on my truck. Right now it has a 2 inch single system that does not sound very good and seems to be quite restrictive.

Since my truck is pretty much stock, should I opt for a larger diameter single system (2.5" or 3") or go with a true dual system with 2.5" pipes?

If I go single system, I would have the pipe exit behind driver's side rear wheel. If duals it would be either straight out the back or side exits behind the rear wheels.

For mufflers, I like the sound of Dynomax on V8 engines, but I have not heard them on the V6. Torn between Ultra-flos and the quieter Super Turbos. I realize many like Flowmasters, but I'm not sure the sound does it for me.

Appreciate any and all input and suggestions here