Sorry for the delay, havent been here in a while. I still have the stock head unit, I t-tapped into the speaker wires to run two line output converters. From there to a Rockford Fosgate punch 200/4 4 channel amp for the door speakers (JBL components front, JBL 2 ways in back) and from the pass thru of the 4 channel into a Rockford Fosgate P3001 mono sub amp. Amps are under the front seats. 8" JLW0 woofer. Box is about 22w x 9h, 3 1/2 top depth to 5 1/2 bottom depth, 1/2 mdf front and sides with fiberglass back for more interior depth. The fiberglass is kind of a pain to work with, protect your work area and wear gloves. The sound is really good, but I'm still playing with the sub to get more output. I think I can get a single Kicker S8L7 solobaric into a box behind my back seat, I'll post if I can make it work. Also, sound deadining my doors really helped with the sound, the truck is quieter which makes the system sound better, and it stops most of the rattles my doors had. The d-cab is the hardest ride I have ever had to put good sound into, but I'm getting close. Good Luck