Nonsense. Usually the aftermarket axles are low quality and fail MUCH sooner than the OE. If your axle just has a torn boot and is not exhibiting excessive play and noise, you are usually better off CLEANING out the old axle, repacking with fresh grease and re-booting it. Don't take the lazy way out and buy an off brand made in a less respected country of manufacture or you'll just end up having to replace it again soon enough. It is almost always true that with only a torn boot, cleaning and repacking the original CV axle will result in it lasting longer than a brand new aftermarket axle. The whole vague idea of "dirty you can't see", well then you couldn't see this invisible contamination in the new axle either, right? Yeah, that's why you clean it out, and you use quality grease instead of the penny pinching junk that junk axles come with, and the junk boot that splits that much faster too.
