Not sure which 2009 BMW 1-Series Air Intake Systems are right for you? We have over 34 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Randy V from Kalamazoo, MI said, "Installation: the foam/rubber hood seal does not stay in placeduring the installation due to the confined space in the 135i engine compartment. I have had to reposition it twice.Performance: once the car is in motion the intake scoops installed with the aFe cold air intake make a difference.acelleration seems inproved slightly. MPG highway has been increased by 3 - 5 mpg."