This system is a 4" fully mandrel bent "cat-back" exhaust system that includes everything you need for a fast & easy installation. Built from high grade 16 gauge aluminized steel for long life and maximum performance. The system includes a 4" Hushpower "PRO" series muffler, premimum zinc coated sure seal clamps, all necessary mounting hardware and easy to read installation instructions. The system exits through a high quality polished 5" stainless steel tip for a finished look.