There will be differences in the material and build quality of the plumbing. Build quality will be lower in the cheaper knock-offs (meaning weld burns, poor welds, sloppy bends) and the material might be thinner/lower grade which can lead to poor welds/bad bends and fatiguing faster.
The Filter element itself can also play in to the value. The AEM filters are better than most others (equal to or better than K&N).
As long as you like it than great, but my guess is it won't hold up well.
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