Meticulous fit and finish. A premium product at a very competitive price.
** The small lawn mowers type mufflers that come in some Espar truck kits and with some Planar heaters should never be used in marine applications. They leak; that's Ok under the hood of a truck, but very bad in a boat.
Espar's 5' flexible exhaust/muffler is expansive short lived and only comes in 30mm. The MSR mufflers are by far your best choice. They come in 24, 30, 38. 40 and 42 mm sizses.
This is just a small sampling of MSR's product line. Call Foenix for a complete listing and a 12.5% Internet discount.