These shorty headers were designed to help eliminate steering system and bell housing clearance issues associated with most long tube and Tri-Y headers. You'll love how the 1-5/8" primary tubes,3/8" thick cut flanges, and stainless steel construction allows you to use them in performance applications and how your Mustang's overall power increases with these upgraded headers. This well-engineered set of shorty-style headers eliminates steering system and bell housing clearance issues. A pair of 2-1/4" Ball and socket collectors, a set of premium header gaskets, and all installation hardware are included. EFI cars require C6TZ-9430-RCO2 Reducer Cones