It's a dreamy composite of very threatening mechanical sounds. 

Several users of the internet have expressed displeasure regarding GM's decision to "simply" modify the Corvette Z06's 6.2-liter LT4 for life as the 2019 Corvette ZR1's 6.2-liter LT5, instead of developing an entirely new engine architecture. 

Sources not actually bothered by the matter allege that besides lacking the basic business acumen needed to understand the complexities of automotive supply chains and simple economies of scale that would make said choice untenable, these doubting individuals simply lack appreciation for fine machinery on a fundamental level. 

This associated sound bite was sent along for the record. The 2019 Corvette ZR1 is angry, properly angry.