If 642 horsepower at the wheels just doesn’t satisfy you, and you happen to own a HellCat, you’re in luck! Hennessey performance is creating an upgrade kit which will bring power up to 850. To do this, they’re playing with several things. First up, is a new ECU and tune. A high flow air filter is installed, along with an upgraded lower pulley which brings up boost by 2psi and a port matched throttle body.

This particular setup puts out 805 horsepower at 6,200rpm. It won’t be long before the Hellcat starts breaking more records with upgrades from Hennessey.