Never did a review before now, I thought this might be a good place for a first. Wow, can you say instant results? For my 3.8 jk two door, i can say absolutely smoother idle, no hesitation starts with great bottom end power and hard hitting top end every time! If your thinking about pulling the trigger on this-this brings it all together. If you have the 3.8 supercharged and don’t have this, you haven’t been paying attention to the reviews. 2010 JK 3.8 that flies. Jerry A. St. Augustine, Florida