As for quality on the ISIS coilovers, for the money they are very good. We ran them on our FD Ls1 S14 and had good success with them. Our pro-am Driver, now going to run FD next season and they worked great for him.
They are definitely an entry level coilover, but for the money they are definitely work it.
I just daily the car, i havent tracked it. You can definitely tell the difference when the dampening is changed, unlike some other lesser expensive brands that you cant tell at all.
The Roads around us are pretty nice, so I dont have any experience with crappy roads.
If you are looking for a coilover for track and expecting a ton, i would suggest saving up and getting a higher end setup. If you have a budget, want coilovers, and want a good ride.. then get these.
Ken
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