I strongly believe that the Lancia Delta S4 Group B prototype has to be the nastiest, deadliest and most potent automobile ever created by a major car company, mostly because it’s powered by a 1.8-liter four-cylinder engine built by crazy people.
In the 1980s, Lancia developed a supercharged and turbocharged (aka twincharged) engine for their midengine/AWD Delta S4 Group B rally car. The idea was the two compressors would eliminate any kind of lag in boost. It doesn’t look like it worked out that way.
The art of the hillclimb is one of loose limbs, intense focus and raw power. Combine those and you've got a stopwatch-murdering time, as long as you've got the shifting skills (and accuracy) of an overclocked cyborg. Watch.