For those who dwell in the world of European performance cars, the B5 Audi RS4 is nothing short of mythical. Built between 1999 and 2001, the B5 RS4 Avant was Audi’s first RS wagon—a wide-bodied, twin-turbocharged powerhouse that was never sold in the United States. So when one appears stateside, fully legal with a clean U.S. title, it’s a seismic event in the enthusiast community. That’s exactly what’s happening now, as AZ Euros—a shop with deep roots in the B5 Audi world—has managed to federalize and list a real, Brilliant Black B5 RS4 for sale.
This particular car, with just under 62,000 miles, is more than a time capsule. It’s a rarity elevated by a few tasteful modifications: a catback exhaust system, 19-inch BBS wheels, and upgraded B7 RS4 brakes. While these changes subtly enhance the car’s performance and presence, they remain faithful to its original character. At $75,000, the price may seem steep to the uninitiated. But to those who understand the blood, sweat, and bureaucracy required to legally import such a vehicle, it’s more than justified.
More Than a Conversion: The Real Deal
To understand why this car is such a big deal, one must first appreciate the landscape of B5 Audis in America. While a handful of enthusiasts have converted standard B5 S4 Avants into RS4 lookalikes—a feat of dedication in itself—there are only a literal handful of genuine RS4s in the U.S. that were imported and legalized through the proper channels. This is one of them. In fact, in the past decade, only a couple have surfaced for sale.
As comparisons go, think of it in terms of classic Porsches or rare BMW M cars. Air-cooled 911s and E30 M3s have skyrocketed in value due to their analog charm and rarity. The B5 RS4, with its wider body, factory-built twin-turbo V6, and wagon practicality, sits in similar territory. It’s not just a cool old car—it’s a piece of forbidden fruit, finally ripe for American enthusiasts to enjoy.
The Journey to Legality
Behind this unicorn is a tale of persistence and passion. AZ Euros was founded in 2013 by Christian and Chad, a pair of Audi Avant lovers who bonded over their shared admiration for the B5 chassis. Their shop quickly built a reputation for performance-oriented builds, especially Christian’s notorious big-turbo Nogaro Blue B5 S4 Avant that’s embarrassed exotics at airstrip races.
But even for them, importing a B5 RS4 wasn’t easy. They first had to acquire a Registered Importer license—a task that took years in itself. From there, the process became even more complicated and expensive. They located a silver RS4 in Canada, which follows a more lenient 15-year import rule, but getting it into the U.S. meant placing it in storage for months and navigating a labyrinth of logistics, testing, and safety compliance.
Eventually, another RS4 surfaced—this one in black—and rather than choose between them, they did the only thing true enthusiasts would: they bought both. After countless hours and thousands of dollars in EPA testing, compliance modifications, and paperwork, the RS4 now for sale stands as proof that patience and passion can pay off.
Real RS4 vs. Replica: The Price of Authenticity
Some may argue: why not just convert a B5 S4 into an RS4 replica? On the surface, it’s a logical question. But a deep dive reveals otherwise. A solid S4 Avant might cost $12,000 to $15,000, and that’s before a mountain of modifications. Authentic RS4 body panels can run $20,000 to $30,000, interior swaps tack on another $5,000 to $10,000, and replicating the drivetrain—complete with K04 turbos, revised heads, and upgraded cooling—adds even more. A true conversion can easily exceed $50,000, and you’re still left with a replica that lacks the RS4’s factory engineering and refinement.
According to AZ Euros’ own team—who’ve built both types—there’s simply no comparison. “Until you’ve driven one, there is no comparison; the RS4 Avant is 10 times better of a vehicle,” they say, and their track record lends credibility to the claim.
A Collector’s Dream—or a Driver’s Delight?
This B5 RS4 isn’t just a car—it’s a moment in automotive history, a symbol of what used to be possible before turbo lag was tamed and digital interfaces took over. It’s the kind of machine that connects driver to road in a way that few modern cars can.
Would it make for a good daily driver? That’s up for debate. Most buyers likely wouldn’t risk it in traffic or grocery store parking lots. This car belongs in the hands of a collector who sees it as both an emotional investment and a potentially appreciating asset. Drive it occasionally, maintain it religiously, and there’s every chance you could sell it for as much—or more—than you paid.
A Glimpse Into the Future
AZ Euros isn’t stopping here. With their hard-earned experience and Registered Importer credentials, they plan to bring more gray market gems into the country. For U.S.-based enthusiasts dreaming of cars that were never sold here, that’s exciting news. Whether you’re eyeing a future RS2, an S6 Plus, or even something like a Lancia Delta Integrale, their work could make it possible.
As for this RS4, its new owner won’t just be buying a car—they’ll be acquiring a story, a passion project brought to life by people who live and breathe Audi. And in an era increasingly dominated by hybrids and software updates, that might be the most valuable thing of all.
