Clearing the marker lights is the best cosmetic mod you can do. You can also grind down the powdercoating on the stock tips to give it a less hidden look.
The stock exhaust on the Aurora is really lame, I suggest opening it up a bit, also gut the intake and cap the air intake resonator.
Make sure the car is tuned that will help. I see your ELC seems to be working, consider yourself lucky...mine doesnt
Mind the foglight condensation...that comes and goes.
Nice car either way.
Oh and FYI, the gf wants a 2002 Bonneville SSEi, silver or black, I want either a 2nd Gen Aurora, 2003 300M Special, Seville STS or Lincoln LS....we'll see