Trident Marine Elbows bring many benefits to an exhaust system. Because they are flexible they allow for tighter connections and miss alignments (i.e. they can be 89 or 91 degrees). They will also help reduce unwanted extra noise while giving a smooth flow for the exhaust. It is recommended that 2 stainless Steel T-Bolt Clamps be used at each end of the connection. You can also order these with the correct clamps to ensure that you have the right parts when you install them.