These 4" black chrome on T-304 stainless tips are made to fit BORLA Cat-Back systems 140755 and 140756. They will NOT fit on the original equipment exhaust system and will NOT fit vehicles equipped with OE trailer hitch. Using BORLA Stainless Steel Polish p# 21461 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. Kit contains 2 tip assemblies with a total of 4 outlets. They are designed to be clamped on (clamps not included, use clamps included in Borla system). To install tips, insert inlet ends of BORLA tip assemblies into outlets of rear muffler assemblies. When using these tips the tailpipe adapters (620359) included in the Cat-Back system are NOT used. Built from premium T-304 stainless steel, superior to T-400 series (such as 409), to give you the absolute best in performance and durability. Precision computer numerical control (CNC) manufacturing ensures an accurate fit. BORLA tips are available in a wide range of materials, finishes, sizes, and styles. They are the perfect way to give your vehicle a custom appearance. Best of all, BORLA exhaust tips are covered under our Million-Mile warranty with the following exceptions. BORLA will warranty black coatings, tip finishes, and carbon fiber parts for one year.