I have a 2005 Titan SE, with the standard 6 speaker system. I would like to do something to give me a little more kick, like some sort of mild sub woofer, etc. Any sugestions?

Get some aftermarket speakers...

Maybe a bazooka for the rear...

concept audio makes a fiberglass 10in. box for the dodge extra cab that i found fits perfect under my kc's passenger rear seat if you put 3/4 in. feet on it to raise it up for down fire.the box is made to up fire in the dodge but fits like its custom made if you add feet and turn it over. the sub is real nice to dual 2ohm voice coils .go to consept audio.com .in my truck i just put in that box two fosgate amps a line converter and two pairs of boston acoustics 6.5 components/just the s60 but they sound way better than stock! hope this helps you .

thanks for the info, I might also have to give that a shot. Thanks for the link!!

All I did was change out the stock speakers "CRAP" and had them replaced with Alpines and a 400 Watt 5 Channel Amp. $400.00 total and it kicks A$$.

That's what I did. 4 new door speakers, Amp and an 8" Bozooka tube under the rear bench in my KC.

blkbelt65, How much did that run you? Do the install yourself

ALL FROM EBAY. So it ran around $250 + the install of $225. So, not too bad.