Cadillac’s CT5-V Blackwing’s “luxury sedan meets American muscle” only gets better with more power. Following a 1000 HP upgrade based on Hennessey’s infamous EXORCIST performance upgrade for the Chevrolet Camaro ZL1, the Cadillac CT5-V becomes an absolute menace on the pavement. Recently, John visited the Pennzoil Proving Ground to record his first impression.