Not worth it, it's a 45 cent resistor from radio shack that you hook up to your IAT sensor which monitors the air intake temperature. The IAT sensor stops working when the engine reaches it's operating temperature and works off the MAP sensor. The best performance you can get is a K&N air filter and a better exhaust system, with the regular maintenance. The other thing you can also do is remove the screen from the MAF sensor, remove the MAF sensor and place it on a bench withe the screen down. With a flat head screw driver, carefully work your way through the sensor not to touch the filament. tap it with a hammer and work your way around till you pop off the screen. Once the screen is off, clean the MAF sensor with MAF cleaner and place back in place. This will give you an extra 5 HP and it's free to do and take about 30 min to do from start to finish. Good luck