The ball joint should not be the problem. The bushing itself is what may potentially be the problem. SPC's more expensive arms have a rubber/spherical hybrid for their bushings which I don't think is legal since metal content is increased and bushing material is decreased. I think they mainly used this because the entire arm articulates. So, without a spherical bushing, it would put a lot of stress on the bushing if you adjusted away from it's true neutral position. But, since the there is no adjustment to the arm itself on the cheaper arm, they can probably use a regular style bushing, either rubber or poly. I've looked at more pictures of them I've found on the interwebs and they appear like they're legal. I may switch to these arms.
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