I am trying to add bass to my 2018 f150 supercrew cab. I know LMI has the lift kit but it’s a little too pricey for me. I’m thinking of using some 2” x 1/4” (thick) aluminum or steel c-channel? But I’m having trouble getting my hands on some. Has anyone done their own modification? Pics? New ideas are welcome.

 

No clue as to what you're talking about?

 

The OP is trying to add subwoofers under their seats to save room.