The most aggressive drop you'll see from springs alone is about 2" B+G and H&R both make sets with that much drop. I can't remember which but one is a raked set and one is a level drop all the way around.
As for shocks, if you're looking to keep the TEMS functionality you're limited:
http://www.horsepowerfreaks.com/View...tails=Illumina
I don't know of any other shocks which are TEMS compatible.
If you're looking for a ridiculous drop (more than 2") you could pair up one of the spring sets mentioned above with Bilstein dampers. The Bilsteins have an adjustable spring perch which gives you an inch or so of additional adjustment. Otherwise it's time to look into coil overs (some of which do offer addon electronic control systems similar to TEMS).
If you doing all this to remove lean and the springs don't do the trick it's time to upgrade your anti-sway bars and start replacing bushings.
EDIT: Here's a link to a shop I trust that sells a few different springs for our cars. The drop heights listed are debatable but it'll still give you a good idea as to which grant the biggest drop.
http://www.horsepowerfreaks.com/perf...ension/Springs