what do i need to install the z2 , i want to- keep onstar and evrything else stock door chimes etc., i already have sirius running to the stock head unit, with a kenwood soundgate and i wanna continue to run sirius, i want to have the ability to run the dvd whild driving the truck, (im assuming there is a bypass) the truck is an 05 hummer h2 , i know best buy told me i need a "installation kit" could i get some part numbers so i can "shop" this stuff
-- interlock bypass
-- sirius capabilities
-- oh and what about steering wheel controls??? THANKS