Audi walked away from a certain customer in 2004. Well, that’s what any hardcore forced-induction protagonist will tell you of the late, great “B5” S4’s demise. That particular car was the first S-car to be based on the A4 sedan and powered by a 270-hp twin-turbocharged V6. Back then, the S4 was the step up for rally fiends – a grown-up, higher dollar take on the all-wheel drive turbo genre inspired by the World Rally Championship, which also spawned the likes of the Subaru WRX and the Mitsubishi Lancer EVO. Highly tunable via a rich aftermarket, one could drop a few g’s on an S4 and toy with supercars at the track. And, if you ask the B5 loyalisti, the magic was lost when Ingolstadt shoehorned its burly 4.2 V8 into the B6 generation S4 - faster out of the box, but also more of a GT and with less tuning potential. Going back to forced induction… well, that has everyone talking for sure… from the loyal B5ers to most anyone else looking for a more efficient take on high performance.