Moran Motorsport from Taylor, Michigan are known for building powerful racing engines. They recently tested one of their 670 ci (10.97 L) HEMI V8s built for Australian drag racer Robert Campisi. The engine made 5,295 horsepower and 3,806 lb-ft of torque at 7,300 rpm on 70 psi of boost from two Garrett GTX55/44R Gen 2 106 mm turbochargers.
Source: Moran Motorsports FB page and Honeywell Garrett FB page via Piotr