Hello Everyone , I'm Tony and I drive an FX35...and I'm in the Process of upgrading my factory installed sound system, and want to know if anyone here that has the same system, can tell me how i can improve a deeper base sound, even if i have to change the sub-woofer..I'm looking for something that i can even put in its place that will fit inside the spare, that will still operate with the bose speakers, I'm interested in reaching deeper base sound!!!