I have a 2010 F-150 Lariat. It has the factory Sony system w/o Nav. I've been getting bored with the sound system so I went ahead and ordered a Sony XAV-712HD HU w/ XA-NV300T Navigation add-on module. I chose the iDatalink Maestro ADS-MRR /ADS-HRN(SR)-FOR01 because I can supposedly retain all my SYNC functions and steering wheel controls vs the PAC where it says I have to plug it in to a sub out and have an aux input...which the Sony HU does not have. To upgrade my door speakers I ordered two pairs of Sony XS-GT5738F. For my amp/subs I ordered a Sony XM-ZZR3301 and two Sony XS-GTR101L that I will be mounting in a box from Fox Acoustics. All parts were ordered from Crutchfield and Sonic Electronix, except the box of course. I chose Crutchfield for the HU and door speakers because they offer alot of the installation accessories at no charge, prices may seem high but when you shop around on other sites (Amazon, E-Bay, and Sonic Electronix) and add the accessories needed for the install your at about the same price but with Crutchfield you get the tech support if you happen to need it and a master sheet for installations. I will post pictures once all is completed.