Each Banks Monster exhaust includes a stainless steel, low-restriction Dynaflow muffler that is acoustic tuned to release a pleasing rumble. The Dynaflow features a four-inch outlet that mates to four-inch exhaust pipes, which vary according to application. Built of heavy-duty stainless steel, these mandrel-bent pipes maintain the same diameter through every turn and never crack or blow. Finishing the serious power look is a colossal five-inch, polished-stainless tailpipe tip.