FYI: You can legally import a B5 2000-2001 Audi RS4 Avant to the USA

(As well as the A4 and S4 sedans and wagons)

No, really. Don't know how many others know this.

1. It's on the NHTSA eligibility list for non-conforming vehicles http://www.nhtsa.gov/cars/rules/imp...

2. A petition was filed to the NHTSA saying it was similar to US models in crash safety equipment http://www.regulations.gov/#!documentDeta...

Of course, it needs to be imported through a registered importer (RI) and various modifications need to be made to actually drive the thing and drive it legally (since it's not a 25 year old classic yet). Relatively small things like repogramming the ECU for US fuel octane which is a little lower than that of Europe, and meeting DOT regs, such as front amber reflectors, as well as EPA regs. I think safety-wise, the petition and eligibility already covered that.

Some text from that petition:

DEPARTMENT OF TRANSPORTATION
National Highway Traffic Safety
Administration
[Docket No. NHTSA–2002–11847; Notice 3]
Decision That Nonconforming 2000–
2001 Audi (8D) A4, S4, and RS4
Passenger Cars, Manufactured From
September 1, 1999, Through August
31, 2001, for the European Market, Are
Eligible for Importation
AGENCY: National Highway Traffic
Safety Administration, DOT.
ACTION: Notice of decision by National
Highway Traffic Safety Administration
that nonconforming 2000–2001 Audi
(8D) A4, S4, and RS4 passenger cars,
manufactured from September 1, 1999,
through August 31, 2001, for the
European market, are eligible for
importation.
SUMMARY: This document announces a
decision by the National Highway
Traffic Safety Administration (NHTSA)
that certain 2000–2001 Audi (8D) A4,
S4, and RS4 passenger cars,
manufactured from September 1, 1999,
through August 31, 2001, for the
European market, that were not
originally manufactured to comply with
all applicable Federal motor vehicle
safety standards (FMVSS) are eligible
for importation into the United States
because they are substantially similar to
vehicles originally manufactured for
importation into and sale in the United
States and that were certified by their
manufacturer as complying with the
safety standards (the U.S. certified
version of the 2000–2001 Audi (8D) A4,
and S4 passenger cars), and they are
capable of being readily altered to
conform to the standards.
DATES: This decision was effective
March 28, 2003. The agency notified the
petitioner at that time that the subject
vehicles are eligible for importation.
This document provides public notice
of the eligibility decision.
FOR FURTHER INFORMATION CONTACT:
Coleman Sachs, Office of Vehicle Safety
Compliance, NHTSA (202–366–3151).

Here's an example of one that was supposedly legally imported:

http://forums.vwvortex.com/showthread.php...

and another http://bringatrailer.com/2013/06/05/ver...

and another http://bringatrailer.com/2012/09/27/non...