There are dozens of remarkable racing series around the world and many of them, particularly GT3 championships, are chock-full of amazing machines. However, it is hard to find vehicles more animalistic than some of those racing in hillclimb championships throughout Europe. These two Alfa Romeo 155s are among the finest.

The first of 155s featured in the clip below is a GTA model originally built for touring car racing in the 1990s. It is thought that less than 20 units one were built and just two of them are thought to have found success at the Italian Hillclimb Championship.

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The 155 GTA racer doesn’t have an Alfa Romeo powertrain; actually, its engine and transmission are sourced from the Lancia Delta Integrale rally car. Power reportedly sits at 550 hp and the all-wheel drive monster can reach 100 km/h (62 mph) in under three seconds.

As for the second 155 found in the video below, it was built for the German DTM series in the 1990s. Powering the vehicle is a naturally-aspirated 2.5-liter V6 with more than 500 hp on tap and revving to a remarkable 12,000 rpm. The car also features a four-wheel drive system and weighs less than 1,000 kg (2,200 lbs). It is an absolute beast and, of the two, easily sounds the best.

If you had the chance to drive one of these Alfas, would you get behind the wheel of the turbocharged 155 GTA or the screaming, DTM-based model?