This 3" diameter into dual 2.25" Borla(r) Cat-Back(tm) system was specifically designed to enhance the power and sound of the Ford F-150 equipped with the 3.5L PowerBoost engine. This system features the classic S-Type sound with no drone. It has a split rear exit configuration with single 4" round black chrome on T-304 stainless steel tips on each tail pipe. Using Borla(r) Stainless Steel Polish p# 21499 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. It is also available with bright chrome on T-304 stainless steel tips. Add Adapter 60556 For Crew Cab With Standard Bed (6' 7") 157.2" Wheelbase vehicles. The entire system is made of T-304 stainless steel and utilizes computer numerical control (CNC) manufacturing techniques that ensure an accurate fit. All this is backed by our unsurpassed Million Mile Warranty. System Features: Cat-Back(tm) System, Split Rear Exit, 4" Round Black Chrome On T-304 Stainless Steel Tips, S-Type Sound Level, T-304 Stainless Steel Construction, Bolt-On Installation, Million Mile Warranty.