I have been meaning to do the exact same thing with my '01 OB. Believe it or not, have the factory Kenwood speakers (4) with factory Kenwood TAPE AM/FM radio and driver's side mounted control.

Sounds like crap - mostly because of hte speakers I'm sure.

Want a basic, decent set-up. Is that Sony unit plug and play or do I need a wiring harness? Will anything I buy come with an appropriate wiring harness or am I going to have issues? How hard is it to swap head units? How hard is it to change speakers to the Polk db 651s everyone recommends?