Manufacturer: JET Performance Products
Purpose: Tuning the engine for maximum horsepower and torque
Vehicle Application: 1987 - present Wrangler YJ/TJ (fuel injected models only)
Typical Retail Price: $170

Description (from the manufacturer): "The ECM in the vehicle looks at various sensors such as manifold vacuum, coolant temperature, throttle position and RPM, it then processes this information and adjusts spark timing, air/fuel ratio and other parameter according to the tables stored in the JET Performance chip/module memory. By recalibrating these tables we are able to tune the engine for the maximum horsepower and torque under various driving conditions."

Note: usually requires the use of premium unleaded fuel

Links to install reviews/reports/how-to articles (if any):

None at this time.