How Many Pipes?

There's a continuing debate about exhaust types and how they look. Personally, I prefer things as stock as possible so my favourite is the 4 pipe (2 each side) just like stock. But then, I remember the Bennelli Sei which had a truly beautiful 6-into-6 silencer with 3 pipes on each side of the bike. But I digress.

Below are three pics of the options: 2 each side, 1 each side, and 1. Your choice.