Has anyone attempted to add a aftermarket stereo, while keeping the stock head unit? I'm hoping to keep the truck looking as stock as possible. I've found a utube video of a guy soldering a 3.5 aux input onto the cd player connection points. I've also found that JL audio manufactures a processor that allows oem intigration (FIX86). Has anyone attempted something like this? When I took the truck to the local stereo shop, they were more interested in selling me on a, tear out the old stuff and slap in new stuff system.