When you're John Hennessey, what you do is add horsepower to everything. Does anyone need a Yukon that gets to 60 in 4.5 seconds? Nah. But damn we're thankful that it exists.
It's like watching a town accelerate.
The HPE650 kit gives the Yukon with the 6.2 liter V8 665 horsepower and 658 pound feet of torque. It gets to 60 in 4.5 seconds. Hopefully it stops well.