you know im not sure. pretty much with shocks and struts you pay for what you get. you might want to look into adjustable shocks. (need someone with more xp to chime in) i haven't dealt with shocks and struts much, as far as upgrading goes. thats my next mod though. the ford racing ones might serve you well or tokico, or eibach. (pretty pricy)
also ive heard you need to upgrade the caster and camber plates (steeda makes some. bout $200) after lowering the car as well as getting an adjustable pan hard bar.
__________________ 2006 V6 Mustang
Ext. Vis: Mineral Grey w/ Yellow Stripes, Tinted windows, Shorty Antenna, Brake light chrome outline, Custom installed Fog Lights (work in progress).
Int. Custom Vis: Yellow/Black Carbon fiber kit, 7 color LED ambient lights, Shaker 500 with PIE module connected to a Belkin Ipod Charger cradle.
Pref Mods: Bamachips 91 race+torque tune, C&L CAI, Custom dual exhaust w/ MAC stainless steel axle back mufflers, Front and rear GT sway bar, Shelby strut tower brace. | 
