you will definately want coilovers for that lower stance. I think the lowest i have seen a spring drop is 1.8 or 1.9 inches. I have about 2.5" drop in the rear with big 55 series tires to get rid of the wheel gap on my 12 v6. The front has no wheel gap almost a tucked tire look with only my coilovers set at half way drop in the front. My rear end is dropped at the max, I used ground control coilovers with koni yellow adjustables. BC Racing has some good coilovers that lower the 11+ mustang even lower then my car is. Just check my profile if you want to get an idea how your car would look having the rear lowered 2.5" and the front is 1.5-1.7" on 18" rims i can still drop the front another 1-1.2" but dont want to scrape my lip. BC Racing standard coilovers is about 3" drop on our mustangs while their xtreme coilovers will do a 4-5" drop.
AirRaid CAI, BBK Ceramic LT Headers, BBK Catted X Pipe, Borla ATAK, MPT 93/97 Tune, Steeda LCA's and UCA, Steeda Relocation Brackets, 373 gears, WaveTrac LSD, Dynotech Driveshaft. Prothane Motor Mounts, Whiteline adjustable panhard bar & brace.Ground Control Coilovers with Koni's custom valved. Coming soon Circle D 3800 Stall and Lone Wolf Intake Manifold.