what’s a good third party GPS system/mount for a 2008 Lexus IS? what would be a good in dash gps navigation unit? I would suggest either Pioneer or Eclipse gps system. You will need an install kit that fits into the space for the radio and has a double DIN opening. Such kits are available for most cars on the market and you can try to find it on eBay, etc. If there is no such kit available for your car and you don’t mind paying the money …