2008 ram 1500 6sp

i've run into some money and i'm looking for some mods that will give me the best bang for my buck. i've already installed a dual cold air intake, aka ram air intake and extended the pipes behind the A/C fan and passenger side headlight, i've also put some JBA shorties with some off brand...

I have a 2008 1500 ST that I would like to lower in the rear by a couple of inches. I haven't found a rear drop kit for this model year. Any prospects or solutions out there?