Not sure which 2005 BMW 5-Series Air Intake Systems are right for you? We have over 330 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Bryan V from Mead, WA said, "Once installed this intake makes a noticeable difference in the performance of this car. The throttle response is much quicker and smoother than with the factory air filter system. It is too new to determine gas mileage, but for drivability it is worth the cost. However, the 20 minute installation window seems to be a bit un-realistic. Allow twice the time."