I want to buy 2 10 inch subs. Will I have to get a custom box or can I fit the box under the back seat? If so how much is a custom box?

 

it really depends on where you go to buy it, or do you mean that you would be building it custom?

 

I have a supercab and i built my box for 2 10's it was really easy and a lot cheaper than buying them. I built 2 seperate boxes and stuck each box on each side under the seats and the amp in the middle where the hump is. The store I went to wanted $60 for each box and i made both of mine for like $25 It took me about 4 hours to make them. Check out my gallery for pics. https://www.f150online.com/galleries...TOKEN=82187532