Hook and chain holds them in place. Select an adapter with at 1/2" diameter clearance around the tailpipe.
F300 - Maximum tailpipe OD is 2 1/2". 2 1/2", 3" or 3 1/2" hose ID can be used with the adapter.
F400 - Maximum tailpipe OD of 3 1/2". 3 1/2" or 4" hose ID can be used with the adapter.
F475 - Maximum twin tailpipe OD 2.5" X 5.5" (oval). 3" or 4" hose ID can be used with the adapter.
F575 - Maximum twin tailpipe OD 2 1/2" X 5 1/2" (oval). 3" or 4" hose ID can be used with the adapter.
Click on image above to view additional images.