Good purchase! Not too expensive, shipping was less than a week. Adds acceleration power and has a nice deep sound. Its not a dramatic power gain but you definitely know its there. Car performs normal when cruising but more fun in spirited driving. Also improved my MPG. Instructions are whatevs but you can figure it out with diagrams.
This is a very nice kit, bought it for my 335xi. Wasn't sure if it would fit but it did. The only thing I didn't like, you have to relocate the power steering reservoir , but not a big deal. The air scoop feels a little cheap but the air filter and tubing are very well made. Very happy with this kit and looks amazing.