Ford's SOHC 4.6L V8 isn't exactly known for its potential to make big power, and saddling it with over two tons of mass means that Crown Vics aren't exactly feared on the streets unless they're being driven by a police officer. Sal Mennella from Power Surge Performance (a shop specializing in Ford PCM tuning) developed a solution for this problem, however, in the form of a supercharged 5.4L that he snagged from Ford's defunct Lightning sport truck. As delivered from the factory, this engine was usually good for about 330 rear-wheel horsepower - a substantial improvement over the sub-200 RWHP provided by the stock motor.
As if that wasn't enough, the stock Eaton blower was replaced with the substantially more efficient Whipple supercharger to provide more boost. The stock heads and throttle body remain, though, as do the stock cast iron exhaust manifolds. This combination produces nearly 540 horsepower at the rear wheels, as well as a dead-flat torque curve that maintains more than 500 lb-ft over the entire duration of the dyno pull.
This has us convinced that Ford should offer a GT500 version of the CV - just so long as it promises not to offer them to law enforcement agencies.