... Clamp and Flange Assemblies Size: 2",2.25",2.5",3"3.5",3.75',4" SS304 & Mild Steel,these are top ... on the GT42, GT42R, GT42RS turbos. For an instance,3.5" Vband machined flange allows typical weld on application or use ... the extra length and lip built in as a 3.5" hose slip on (has the proper width for a T ...