I've got that (virtualo) thing in my 2002 X. I run audio from an OmniFi Media player (20 Gb hard drive under the seat, controller on the dash) directly into my stock X head unit. Totally plug & play. Er, plug, splice some power, mount a switch, and play. You'll probably need a signal booster, however; depends on your audio source's output power.

And oh yeah-- it works awesome. Thousand times better than the crapola AM-sounding RF modulator I was using.

But keep in mind that (I think) these things are made by one dude. It took him 'bout a month to get mine to me. Worth the wait.