I bought an sa 9360 stp air filter for my Toyota. The old one I took out - also an STP 9360, had the part number on it (nice so they dont get switched in the store boxes), the old one also had the up side marked on it and also "front" marked on it. The new one had NONE OF THESE. Poor poor poor! I wounder- was this a mistake at the factory or a cost cutting??? it can be installed wrong easily causing problems closing the air filter box.