you can buy rear windshielf louvers for newer mustangs. they actually look real good and aren't too expensive. they're also hinged so you can clean the glass. I'd get them if I drove a stang.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15