This DeatschWerks Ford 4.6 3-valve fuel rail with crossover is specified for 2005–2010 Mustang GT SOHC applications and the listing clarifies it does not fit DOHC or supercharged models. The crossover-equipped rail supplies the plumbing layout intended for those specific SOHC GT engines as described in the product text.
DeatschWerks Ford 4.6 3-Valve Fuel Rails with Crossover