Dynomax 41957 Connector Pipe Offered in a variety of styles and sizes for your installation needs,Manufactured from aluminized steel for durability Dimensions:Inlet - 2 1/2" ,Outlet - 2 1/2" ,Overall Length - 4" For use in connecting exhaust pipe and/or tubing Burr-free construction for proper fitment Walker supplies all of the accessories you need to do the complete exhaust job