I did it in my 2008 GXP, it was pretty easy as far as things go. Mine has the Monsoon system, so it could be different than yours.This thread has some part numbers for the pieces I used, yours could be different without the Monsoon so do some research on Crutchfield before purchasing anything then make your purchases wherever you find them the cheapest.

http://ls1tech.com/forums/ls4-perfor...n-install.html