quest does make really nice coilovers I used to know some people that had them and i'd go out on a limb and recommend them over the ksports. The ksports have 7kg front springs and 4kg rear springs and if you need something different all you need to do is order different rate springs from any springs manufacturer like eibach, swift, h&r.... since all you need is an equivalent spring in the same diameter and height. I run the normal ksports rates and they are pretty harsh for the street but seem to work pretty well for autocrossing with my rear bar at full stiff.
just remember you dont want to go too stiff unless you are going on a track cause yeah stiff suspension helps out but same token public driving roads arnt maintained the same way as a race track or you'll be driving over a rock and feel like a brick and bouncing you which isnt traction. i would go with coilovers and adjust it as stiff as you want but just remember stiffer isnt always better it depends on the driving surface. just looking out for fellow hyundais lol hope this info was helpfull to some one
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