[masraum]

I had one of the RF transmitters in the past. Some work better than others, but I don't think any are great. I had a Grom ipod unit that plugged into the back of the stereo that worked well and gave great sound, but it did require pulling the radio which these days usually isn't that hard. Maybe 1 - 2 hours for most vehicles. I think they usually run $100-200. The sound was great since it plugged into an unused plug for a CD changer in the back of the unit and allowed some control of the iPod from the stereo controls. Some even include Blue Tooth modules. Next to a stereo replacement, that's probably the best bet. What is available for your vehicle will depend upon the year, vehicle and stock stereo. Even so, you'll probably have to order from the Internet, wait for delivery and then install.

It sounds like your best bet is an RF transmitter since it sounds like time is of the essence.