Lowrance iway 500C has 20GB hard drive for full US road maps and 10GB dedicated solely to MP3 player. touch screen unit and integrated sound to the stereo. Really is an excellent unit. I used a dremmel to remove the line of buttons (seat heaters etc) and removed the cupholder and extended the space to accommodate those buttons, rewired so the harness would reach and then drilled a hole and fitted the airbag light, i then fabricated the surround for the unit from wood and coated with Bondo, after about 100 sprays and rub downs it was done. Still a little tidying up to do but other than that, im really happy.

All that's removed is the ashtray and lighter...