I installed speakers onto the small holes under the pop out windows. a 8" jl audio sub in each hole,,,i made 2 boxes and installed them from the rear of the panel,,,it looks factory,,,i also installed a 12" jl audio under the rear drivers side seat (in the storage compartment),,i made the box the same size and shape as the hole,,,,1" dome tweeters on the front pillers,,,4" speakers in the dash,,,and q-logic kick panels with 1" dome tweeters and 6 1/2 speakers,,,,,,,,amps fit under my seats and crossover in the glove box,,,,,,,,you can also put some in the doors,,,and if you look at the rear trim panels in the extended cab, down in the back you will see what looks like a vent,,,you can fit 4x6 speakers in there,,,,,,jl audio also makes a box for the extended cab that goes in the middle of the 2 rear seats,,,,,,,,,,,,,i do not know how to post pictures on here but if somebody tells me how i will take some and post them