I read your subject and started laughing, DUDE, YOU'RE SO RIGHT!!!

I didn't upgrade the head unit. Too many upgraded head units cause the truck to get broken into. I upgraded the speakers first (Polk) and it helped, but not much. I invested $80 in an amp from Radio Shack, just to install and try (thinking I'd by a "quality" amp if it worked well). Its AWESOME. I thought I'd wait till this one died before i spent "real money" on a brand name amp, but she's still going strong and the sound is incredible.