You can achieve a 1-2" drop with lowering springs. Anything more and you'll want coilovers.
03 V6 with H&R SuperSports, no isos, cc plates = ~1.75-2 finger gap (front)
04 Mach 1 with SR Lowering Springs, no isos, no cc plates = 2-2.25 finger gap (all around)
12 Black GT500 SVT PP l VMP TVS l JLT123 l O/R X l 28x11.50Rx15 M/T Street R's l BMR Suspension l Recaros
03 Sonic Blue 3.8 / 17 Magnetic Fusion Sport 2.7 EB