What makes an exhaust droney?

[Scotty-boi]

Thinking ahead, I'm after an after market exhaust. But i don't want something that's gonna do my head in!

What is it that makes an exhaust drone?
Bore size? Silencers or lack of?

Only looking for cat back if that makes a difference.

 

[yeecup]

Bore and lack of silencers

 

[Scotty-boi]

So if I wanted a nice sound from a cat back. What would be ideal