This is a pretty inexpensive "mod" that also adds functionality to your house. The X10 products are actually pretty good and add some nice functionality to your home. The catch is to wade through their TERRIBLE web site to figure out what you need and then buy it elsewhere for a better price.

MODS/UPGRADES:
17x8" BBS RKs (great AW story about how I got them...) | H-sport anti-sway bars | ToyGuy short shifter |
IceLink/iPod integration | Escort 8500 hardwire | fog/running light rewire | HomeLink home lighting control |
fold-down bag hooks in the trunk | aux power socket under the armrest | hidden Symphony EQ settings |
remote locking control recode | debadged

SUGGESTED READING FOR C5 A6 OWNERS:
2001 A6 info from AudiWorld | 2001 A6 info from Edmunds.com |
Audi 2001 maintenance schedule | Stoney's links (the ultimate A6 links page) |
the nOOb's guide to everything | how to make your car shine

The other ride: 1998 Mitsubishi Montero (typically with a kayak on top)