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I've never used the SPC but I heard that people had issues due to the nut at the top of the balljoint. Search it was posted here. I've been using aftermarket control arms for almost 2 years with no issues. Bought them on ebay.
I'm not posting my own experience so no need to put ! Every person has different mods installed on their car. I can say that if I had this installed and drove at my height than they would hit the shock tower more often due to the fact that the nut on top of the balljoint does add height to the overall arm.