need help building box

Does anyone have dimension's on building a sub box for under the driver side back seat in a '04 silverado ext. cab.

i build sub boxes almost every day. and for underseat boxes like what you are talking about, you will be better off just getting a pre fabricated box, they fit, and they already get you all of the airspace you can get under there. Unless you are trying to do some crazy ported setup, you arent gonna really gain from trying to build your own... IMO.

what are you trying to fit?

---------------------------------------------Originally posted by installguyi build sub boxes almost every day. and for underseat boxes like what you are talking about, you will be better off just getting a pre fabricated box, they fit, and they already get you all of the airspace you can get under there. Unless you are trying to do some crazy ported setup, you arent gonna really gain from trying to build your own... IMO.--------------------------------------------- x2, OP also consider doing a seat lift to maybe fit a larger box.