I recently bought a few MOPAR air filters for my '99 LH car, part # 4591100AC. I noticed that the filters seem to be lower quality than they were a few years ago when I last bought some OEM filters. They are not stiff like they used to be (a little stiffer than Purolator), the paper element is now yellow instead of white, and they say Made in Mexico instead of Made in USA. The specs printed on them are identical to my older OEM filter. The part number hasn't changed, so I assume it is still the same supplier. I guess there is no reason not to use Purolator, which seems to be equivalent quality and are even Made in USA, as of the last summer, anyway. A fews back, the OEM filters seemed to be much more sturdy than any of the aftermarket filters.