8This is from Hennesey's site
"Key to that 717 bhp (and the HPE700’s deep well of torque—632 lb-ft at 4400 rpm) is the Roots-type high-helix supercharger packing 7.25 psi of boost. Helping the Coyote V8 breathe more deeply is a high-flow throttle body and stainless-steel exhaust system. Upgraded injectors and fuel pump help feed the V8, under command of Hennessey’s proprietary engine management calibration."
http://www.hennesseyperformance.com/...d-mustang.html
Maybe and most likely its a typo and should read something like 17.25psi.