Since SVTP has been no help thus far, I figured i'd post here before buying new.
Looking for mainly Eibach Sportlines, but would also consider Steeda Progessive springs as well.
aFe CONTROL (the suspension side of aFe POWER) is excited to release the Lowering Springs for the S550 Mustang EcoBoost/V6 and GT. Spring rates have been optimized to work with the OEM shocks for an improved balance of ride and sportiness. Our springs reduce the bounce that the mustangs are...