Why build a six-second dragster using a 4.2 liter Audi V8? Why not?

BangShift points out that this is a largely stock engine, though it is turbocharged and its stock headgaskets blew five seconds into this 6.82s run.

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All that being said, this may well be the quickest 'production' Audi V8 in the world right now and a testament to 'why not' engineering at its finest.