Ive used both, and a few other brands
King springs are pretty good value for money, never had any issues, maybe some slight sagging over time but nothing major
Kmacs tend to be rough & ive heard of/seen issues with them being noisy
save yourself problems and save up a tiny bit more and get tein ss from say titan motorsports overseas. Their adjustables so you can change the ride height and softness to your liking.
My old drop was 3.5" on kmacs and the ride was bumpy as hell, very uncomfortable.
I have the same drop now with tein ss and it rides like a dream, actually more comfortable than on the stock springs.
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