BoomTaco64
CarAudio.com Elite
all the products from there are good quality for the price. components are only like $99 a set...subs are greatly priced. amps are good as well. sure you can buy used for a little cheaper as well.
Just to give him an idea what does a blow through run? Cutting the bed and cab, sealing it right, and building the boxsure can, i have done that quite a few times for customers. actually a clever idea if secured down correctly.