It did add some power. Subie Chick is right. It gets this power surge like it just got injected with car steroids at 3500. After I got it installed at about midnight, my friend and I took it out for a test run. All of a sudden this redneck(no offense) ***hole comes racing up the road from behind me in his Dodge Ram and cuts me off. Jumps out of his truck, comes over to my window and starts ranting about racing up and down the street. So you know its loud when it wakes up the neighborhood. What else can I say, I love the thing. Sorry for the long post, but I just get hyper when I started talking about my car.