I have the GKTech Grip front knuckles and lower control arms. I just put them in and only had one track day but they felt pretty good. Will need to do a few more days to get a better idea.
Quality seems pretty good. I had a few small fitment issues due to my other parts being SPL but I resolved most of those. They are pretty good at answering questions on their facebook chat.
I am considering getting their rear lower control arm and knuckle.
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