they rattle coz of the solid pillow tops....most brands will get that rattle/knock sound due to the solid pillow tops...unless u use the OEM pillow tops then it will be nice and quite.
all depends on what purpose u want to use the sussy for? track or street.
I've got TEIN HA and am waiting on a set of TEIN FLEX to arrive to replace them. the HA's are a little firm for sydney's roads, but are great on the track, i'm hoping the flex will be more comfortable on the street and i'm sure they will still handle the occasional track work.
Any suspension with solid upper mounts will rattle eventually, its only a matter of time.
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