I am writing a review about the filters because I have not used any other parts, but externally they are identical to the original parts. I've read reviews of the foam pre-filter that they only came with 5 packs instead of 2 packs, but when I inspect the filter there is a thin, clear screen covering the filter. I find this to be a great way to prevent the filter from clogging and is easier to clean. and also every week or two I use my air compressor to blow it out so I shouldn't change them too