The 5.7 HEMI is one of the most recognizable and celebrated American engines ever made. It's a beast of a power plant, with up to 395 horsepower and 410 lb-ft of torque on tap — right out of the box.

If you are looking to get more power and better fuel economy from your vehicle, one of the simplest and most efficient options is an aftermarket engine tuning device. Some people might refer to these ...