If you have the moonroof, then no, the map light is not a festoon, it's kinda like a spring loaded bayonet IIRC. With the festoons, depending on how bulky you got, you may not get as much light as you intended on. Have you ched out these Led dome lights? Check my sig an you can see how bright the blues are and typically the blues are the least bright of the LEDs with the exception of maybe the UV ones. For the dome's, you could actually fit 2 2x2 grids in there and for the map you get get 1 2x2 grid. I've only got 1 2x2 grid in both the domes. Yes they are more expensive than a simple festoon bulb, but you def get what you pay for with these. Only issue is sometime the connections may come undone during shipping. Resolder it and they work perfect.
April 2010 Co-MOTM * Custom LED Gauge Cluster swap * LED dome, HVAC, and shifter * Retrofit projector w/ blue halo * Kenwood KDC-HD942U * Herculined cargo area * Debadged *Wolfman's Garage