There are many relatively simple ways to add horsepower to your car's engine, such as installing a better intake, ...

The twin-screw supercharger is similar in appearance to the Roots supercharger but operates differently. It uses two helical screws that compress air internally before delivering it to the engine.

Luckily, the aftermarket has found a way to make the twin-screw superchargers available on every version of the Hellcat's 6.2 HEMI compatible with the underpowered 5.7 HEMI. Read more: Major Car ...