Basically if your ecu is stock this is where the emanage comes into play. I have the Ultimate Emanage hooked up with my ecu chipped by RS Emphalty, and it doe's nothing, because the map from RS is already ridiclously wicked. I like how it has two modes where you can set one stage up for street/race. Which is pretty nice. The program and everything is nice, but if you're looking for numbers, its best to be sitting on a dyno. But overall, the unit is nice.