so ive been reading about them all day and im kinda confused about one thing. do you just plug it in and it magically adjusts to your car or dose it need to be tuned. or is it just pre programmed?

 

It comes with a base map, you can tune it for your specific mods if you want.

 

you just hook it up to your ecu and it basically reads the information, changes it alittle, and then sends it back out. it is pre-tuned but the map on it isnt the greatest. you will notice a difference in pulls, but you will feel it alot more when you get it tuned