Triple.

Exhaust is on and it sounds awesome. Have not driven it yet for the long street test haul, will do very soon. Very busy with work.
I'll post flicks as soon as I can, maybe by this weekend.
The mufflers are tucked nicely away in the muffler cavity of the under body. The exhaust ever so slightly veers upwards from the collector point to assist in the Heat rises theory. Maybe that alone enhances the flow which is much needed with an aluminum exhaust.
In this case, size does matter. I was told by Chris over at Unobtanium that the larger the tube size, the better scavenging of heat to keep the system from getting too hot.