Two Brothers M series exhaust canisters feature the highest level of quality construction and are designed to be fully serviceable in the event of damage (replacement parts are available).
The exhaust note produced by all Two Brothers Top Level exhaust systems is best described as being deep and throaty without suffering from the shrill whine normally associated with other manufacturer's straight through muffler canisters.
All of the canisters perform and sound the same, they are simply different shapes.
They all incorporate Two Brothers exclusive technologies and premium construction materials.
The shape and orientation is normally determined by Two Brothers R&D department, based on a performance criteria check list.
All aluminum systems include U.S. Forest Service approved spark arrestor.
The carbon fiber exhaust systems will not be as durable as a metal muffler would be. If you do go down, rather than bend like an aluminum or titanium muffler, the carbon fiber will crack or break. Keep in mind the carbon fiber cans also require a much stricter re-packing schedule. If you do not keep the muffler fully packed at all times, the carbon fiber can get to hot and become very brittle. Truthfully, there is no performance gain except for a small weight savings when using a carbon muffler.