Lately, I've been thinking about getting Ksport coilovers for my sedan. Currently on Tein S-Tech springs. I also want to get an air cup kit just to lift up when I need it. Car isn't too low right now, but I'll scrape every once in a while when going over a speed bump.

If I do get the coilovers, should I get a complete front and rear kit or would a front kit be good enough?

 

Typically speaking, a front kit is the only one that you should need, however having all four corners raise gives you the most amount of clearance. Front only really helps leaving/entering driveways, where as rear will help to fully clear speed bumps.

As for a cup kit, I would recommend looking into Fortune Auto vs. KSport, as they sell a fully modular coilover that has upgrade potential, as well as their own tailored cup kit to work with their coilovers. They also provide custom valving upon request, as well as custom spring options to help piece together the right setup for your car.