2.5 in

Performance Muffler size--2.5" Dul Inlet (ID) 2.5" Dul Outlet (ID) | Body Length: 17"| Overall Length: 23"| Body Height: 4" | Body Width: 9". Aluminium construction--Aluminized steel construction and internal drainage system for maximum durability，Internal partitions with the change of temperature, the deformation is reduced by thermal expansion and cold contraction.