2004 545I Performance Mods???

I just purchased a new 545I 6 speed. Car was delivered on Friday afternoon. I am having a blast and am so happy that I purchased this car, coming out of an 2002 Audi A6 2.7T. There is no doubt that this car is smoother, has crisper handling, and has more muscle.

I have begun to look into aftermarket tuning companies with much challenge. I looked at Dinan, they have not yet begun development on the 545. I looked at Haman, Hartage, and AC Schnitzer, with little luck as well.

There is a smaller tuning shop here in Chicago called Midwest Motorsports. Thought I would give them a call. Any other suggestions?

I am not looking to do much, maybe a chip or software upgrade and an exhaust to start. All responses and ideas are appreciated.