As far as noticeable performance, you can't feel any extra hp. The throttle feels a little more responsive and the car feels much less chuggy between 1500-1700 rpm. Its actually quite comfortable down there now. Over a 1000 mile test before I averaged 30.3 MPG and 37 MPH. After I installed it I ran the clock for another 1000 miles and got 31.2 MPG and 36 MPH. I drove it the same as i always do. 1000 miles probs isn't enough to really say but seeing as she only has 3300 miles I couldn't really do longer test. For $130 I'd say do it. It likely doesn't make too much of a difference but for $130 you can't expect too much of a gain.