Hello All: Just wanted some input out there. I need a MAF Sensor For a 2008 BMW X3 3.0si They aren't cheap for for the better ones on the BMW websites. I see them for sale on Amazon etc... for $40 dollars. They run upwards of $200 + just curious if the cheaper ones work like the expensive ones? I know you get what you pay for etc... but anyone have any suggestions or experience using a cheaper part form say EBAY or Amazon ? Comments ! Cheers...