i have a huge collection of mp3's and wma's on my computer that i want to hear while i'm driving my 06' GMC Sierra........my truck also has the 6 cd changer bose system which came with the truck....its a Z71 ext. cab

It's an '06, it should play Mp3 CD's. Check and see.Otherwise, you're out of luck -unless you upgrade to an aftermarket CD player.Have Fun!

you have several options.You can use your ipod through an FM modulator, or for cd quality sound you can use this:http://item.express.ebay.com/Consumer-Electronics_Car-Electronics_Car-Electronics-Parts-Accessories_USA-SPEC-PA11-GM-IPod-Chevrolet-Impala-Monte-Carlo-SSR_W0QQitemZ160155552984QQihZ006QQptdnZCarQ20Elec tronicsQ20PartsQ20Q26Q20AccessoriesQQddnZConsumerQ 20ElectronicsQQadnZCarQ20ElectronicsQQptdiZ958QQdd iZ945QQadiZ967QQcmdZExpressItem

use this interface to feed audio in to your factory gmc sierra radio and use any portable mp3 http://www.oemautosound.com/pc-304-151-pie-gm12-auxv2-gmc-auxiliary-adaptor-2002-2006.aspx

i like the other answers, but you could just burn your mp3 collection as wave files onto a cd and play them in your regular cd player...on a cd, like what cd players that don't read mp3 files are supposed to do.