Wehrli 04.5-07 Dodge Ram Cummins 4in Down Pipe - w/High Mount S400 Turbo & 2nd Gen ManifoldWCFab 4" Turbo Down Pipe for 2004. 5 2007 5. 9L Cummins with High Mount style turbo on 2nd Gen style exhaust manifold allows for a quick and simple down pipe install. No cutting of your exhaust system required! This down pipe connects to the v band flange on the exhaust pipe just as your factory turbo cast elbow did. The upper flange measures 4. 6" diameter to mate with S400 exhaust housing. The lower flange connects to the factory exhaust system v