I upgraded all of my speakers to the pioneer series right below the pioneer premiers. 4-way 6.5" pioneers in the doors, 5-way 6x9" pioneers in the back, Pioneer head unit, and JBL tweeters(only because I was getting a better deal on them).
I just wanted to say that I am the creator of this how to. I originally created it on the cobaltss.net forums. I have no idea how it ended up here but I hope it benefited someone out there.
Sub and amp are still pounding away and sounding great!