Im a new guy on the site and a 07 Tundra owner. I have some tips on installing sub(s) to the stock non JBL stereo. Excellent upgrade to the sound system, keep your stock look and keep that nice 6 disk cd changer (complements of Toyota)! Here is a look at my setup. Nevermind the messy wires. Oh, and this is for the double cab Tundra. Reply with questions and we can get yours in also.
birds eye view...
side view...
another side view...
view with the rear seat down, out of the way...
No cutting of wires or interior carpet/panels!