As the E34 M5 and W124 500E/E500 creep up in value, if you search you can still find excellent examples of the odd-ball turbocharged inline-5 all-wheel drive wonder from Ingolstadt. While both of those cars are legends and fan favorites in their own right, I’d like to suggest that most underappreciated yet most capable of that generation was the C4 Audi S4. Out of the box, it was at a disadvantage to the other two; it’s small displacement cast-iron inline-5 hung fully in front of the forward axle line and was at a distinct power disadvantage. With 227 horsepower on tap, it was some 84 horsepower shy of the S38B36 and nearly a hundred down on the M119. But it was turbocharged, so torque was over 250 lb.ft – close to the BMW’s level. Still, they were fairly heavy and if you wanted to shuffle with the Municher and Stuttgarter, you had to keep that AAN on boil and on boost. But the trump card that Audi presented in the market at that point was all-wheel drive, and coupled with the tunable nature of the AAN, it meant there was a lot of potential in the chassis of the C4. That was met with excellent build quality to create what was perhaps the zenith of Audi’s production in the inline-5. Despite that, they have remained far more affordable than either of the competition, though finding a good one today can be difficult. One of just 399 ’94s sold in the U.S., this Brilliant Black example is one of 50 sold with black leather: