the original mp3man was a PC104 based device.. if I remember right.. the big problem with the board you linked is this.. it has a cooling fan.. if it has a CPU that get's hot enough to need a CPU fan.. it's going to generate way too much heat for an in-dash DIN module.

according to the specs.. it's going to require _minimum_ 2.55A at 5v. this is almost 3 times what the empeg takes.. and people say it get's too hot in the dashboard.. (mostly due to the VFD tho) 1A at 12v (regulated to 5v) is really the most I'd want to use for a car player.. exspecialy if you want to add internal amplifier circuts. you have only 15amps to play with for the accessory line in the car.. and a lot of that gets eaten up by other things like a cigarette lighter, power inverters, ham radio equipment.. etc.

12gig red mk2 -- 080000125