$3 Sub Modification

[TuckerTravis]

Replacing the piece of crapolla dryer lint foam in the sub box with polyfill is a must. It will atleast double the bass of your stock sub. Great and easy DIY project.

 

[Aaron]

Got a huge thread on it here: http://www.fordraptorforum.com/f12/%242-99-sub-modification-11638/

but yes I agree, I did it and love it.