There were some early noise issues with these but they seemed to be resolved now. These are considered a HIGH END coilover's that work well on the street as well as the track, and this is a very low price if the 20% number is reached.
You can choose RS One (1 way), RS2 (2 way adjustable), RS Pro (2 way with canisters) and RS Pro 3 (3 way with canisters)
Apex has some preset spring rates they suggest depending on what you're looking to use them for.
You can choose Hypercoil spring rates and Ground Control street or race camber plates along with PowerFlex rear shock mounts.
Looks like shipping is included!!
https://www.gangup.com/apex/jrz-rs-e9x-e8x-q1-2019.html
Good discussion here from the track section:
https://www.m3post.com/forums/showthread.php?t=1541700
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