I have created a manual that covers the complete installation procedure for installing an aftermarket Double Din Stereo System into a 2008 Toyota Prius Hybrid Touring Edition. This procedure will work for ANY Prius with the JBL Sound System with or without Navigation. You will retain all steering wheel controls, MFD Functionality, and absolutely NO error messages or error dash lights if this manual is followed carefully. I decided to write this manual after noticing that there were so many people in need of help when installing into a Prius with JBL & NAV. This manual is still a work in progress so check up and re-download it weekly to see any new additions (Images and solutions to questions or comments). Install with Caution and Comments appreciated!