Pretty nice head unit.

I'm going to be installing a Pioneer AVH-P3300BT into my 05 GT w/monsoon. This deck doesn't come standard with GPS however you can add on GPS for around $250 if ever needed so I like that option.

Also, it has a similar 6" screen, USB, aux input AND SD/SDHC card slot in front.

The SD slot makes this Pioneer a standout for me because I can stick a 64GB card into my deck and hold a sh*t load of music/movies without even having to plug an mp3/iPod/iPhone in.

Things you will need for sure:
- $100- Axxess ASWC -Steering Wheel Control Adapter
- $100- Metra's GMOS-04 - GM Class II data bus interface (retains OnStar/chimes/DIC) if you have a Bose/Monsoon system. PITA!!!
- $15- Mounting Kit for your Double-DIN (2004-UP Grand Prixs)
- $10- Antenna Adapter (1986-UP GM)
- A lot of time and patience to rewire/cram everything in behind the dash!

Any more questions just hit me up! Good Luck!!