What is the difference in a one chamber flowmaster or two chamber?

I have a 2005 dodge ram 1500 5.7 V8 which flowmaster would be better? Thanks alot|||A single chamber is better for a heavily modified engine.The two chamber is still pretty loud and has a nice sound but is better suited for street use on a mildly modified vehicle.|||The difference is a 1 chamber has 1 baffle in it, this will be louder than a 2 chamber which has 2 baffels. The 40 series original is a 1 chamber muffler.|||Two chambers will be quieter than one, with three being the quietest.