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.

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.