The seat belt alarm....there is a way to turn it off but i do not remember the sequence.....try asking the question in 4.6 modular forum......all 04 mustangs are not 40th anniversary even though the badge on the front fender says 40th anniversary. The only true 40th anniversary mustangs have a $1000 upgrade package....bullitt pedals, special floormats, theres a 40th anniversay badge down by the shifter, theres no trunk wing, the rims are painted to match the stripes on the hood/trunk. The only colors you could get the 40thanniversay in were black, white & crimson red. You could only get the crimson red if you bought a 40th....black & white came with any model of mustang.