I have front & rear Swaybars + Whiteline heavy duty endlinks since 2018, I do not have the atq subframe collar kit, IMO I don’t see the long term benefit of them.
The Swaybars & endlinks are a great upgrade for this car, however I have recently added Ultra Racing chassis braces & I can confirm that adding these will definitely tighten up the handling & will keep the car planted especially when cornering.
I only have the mid brace & rear brace fitted which I find is sufficient as the front section of the car is well braced already with gearbox mounts etc.
I highly recommend these to anyone who is after what you are looking for.
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Kia Stinger chassis braces by Ultra Racing
ultraracing-usa.com