I own a 1999 Mustang Gt, its capable of running 13's i have outfitted the gt with C&L Performance upper plenum, a Steeda Autosports intake spacer, a 70mm throttle body, a MAC cold-air intake, MSD coils, a full rosh exhaust including long tube headers, 3.73 hickory gears, an SCT X-Cal 3 tuner, and BFG Drag Radials. The battery now resides in the truck and i have added upper and lower control arms. I still think i can squeeze a little more out of it.
Most of these mods are new.