SGII is not part of the NAV, I have SG1, according to many SGII is not worth the money and I'm glad I did not get it. It has the same cheap paper whizzer cone speakers as SGI, I doubt it really makes 380 watts, and the sub is a measly 8". Spend your money on PGII, the window curtains may save your life see www.carsafety.org and check out the side impact results for Camry and Accord for a chilling reason for curtains. Also get the HID headlights, worth more than the asking price.