I like your information on after market head unit. I'm building a custom Sonic for GM SEMA show. If you would please contact me, as Valor is sponsoring with their double din unit on my project. I read what you wrote on forum, but would like to know more having all the correct install parts/accessories so all oem i.e. on star, phone etc works to factory specs. Or knowing what I might lose installing after market head unit. You can also contact me at info@fearone.com. Thank you for your time and any information u can provide.