Anyone know of any 3.9 mods besides crabs and exhaust?

HSRK....Vector has a Heat Soak Reduction Kit.
It basically moves your temp sensor in your intake and replaces it with a
better sensor.

I didnt notice a thing on my butt dyno but my dashhawk shows it updating like crazy.

You would need a CAI first.

Clicky here for the HSRK (http://www.vectormotorsports.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=63&category_id=11&manufacturer_id=0&option=com_virtuemart&Itemid=28)

You can also get a tune. GTPrix on here does tunes. I have his.

Here is his site. (http://www.whiteautoandmedia.com/index.php?option=com_virtuemart&page=shop.browse&category_id=17&Itemid=54)