2006 4.8is.
I originally got a jl audio fix 86 to correct the signal for my new amp, but that didn't work. For some reason it wouldn't create a full signal. Finally decided to get a new deck. Seicane android 8.0. Unfortunately it didn't come with the canbus so my steering volume controls don't work yet. Seicane has terrible customer service, just an fyi. I replaced my door speakers with jl audio c3 600 components. They fit perfectly into the stock plastic baskets that the original speakers were in. Just some silicone or liquid nails to hold them in place. I ended up putting the crossovers in the doors with double sided tape, gorilla tape. I ran 14 guage wire all the way from the back to each door. The rubber boot from door to frame was tricky, but after some brute strength and cuss words, I figured it out. When you unscrew the boot, there is a large connector. On the top of the connector, there is a small wing pointing upward. I cut that off with snips and that gave enough space for the wire. I used a wire worm, got it from Crutchfield. Taped the wire to it, slathered it in hand soap for lubrication, and it slipped right through. Big pain because there weren't any videos on rewiring door speakers or how to take apart the trim to run wires so I just cussed alot and got through it. As for the tweeters, they were part of the components, 1" tweeters. The factory location is larger so I used foam water line insulation. Bought a piece, cut 1" pieces that fit right around the speaker, then double sided tape on the outside to keep them from moving. They didn't really need the tape, just squeezing the foam tight and stuffing it in should do the trick.
I pretty much copied the amp location from bavarian sound. I fit a jl audio xd700 5v2 5 channel amp. It has enough power to run my speakers at peak rms. I'm still waiting on the jl audio stealth box to arrive so for now I'm using a ported jl audio 10w6 until it arrives.
It sounds Amazing! Compared to stock anyways. I may in the future upgrade the jl audio c2 to a c3 or c5, but they're pretty expensive. I have not yet installed the fro t and rear cameras, or the tv tuner. I'm taking a break til the sub enclosure shows up. I will post a few pictures of the wiring through the door and the tweeter install after I get the sub installed. Oh, also put sound deadened in the doors, you can barely hear anything outside the truck while inside its thumping! No rattles. Windows dow. You can hear it down the block.