Are you satisfied with your V3s?
I like mine, very comfy and precise steering but I am thinking about adding front/rear stabilizers.
My KwV3 coils were phenomenal, for a short time. The ride was firm, flat, comfortable and composed. Installing the KwV3 truly made the Stinger feel like a premium vehicle. The ride was better than original and the handling increased too. Bumps and bad pavement were dismissed with single, solid, thumps that did not shake or vibrate the vehicle.
Unfortunately, my KWV3 quickly became defective. The ride and handling deteriorated into a bouncy, noisy mess. The KW developed noise over bumps and shock damping failed. Each day I had to increase the shock valving, just to keep the car feeling stable. It would suffice for a while, but after 30 to 100 miles driven, the shocks would start to soften again. I would turn the damping up again, and all would be fine for a bit more time. Eventually, the ride would diminish again. Very bad body control, shock absorbing, and handling. This process went back and forth until I had run out of adjustment range on the shocks, I could no longer stiffen them because they were at max stiffness. But now damping still was insufficient. The shocks were so bad it became dangerous at this point... With each shock possessing a different level of wear and functionality, the cars handling became unpredictable, especially on wet roads. The rear of the car would routinely snap around and try to lose control. Shocks must be balanced front to rear to prevent excess under/oversteer.
All of this happened over the timeframe of 30 days. They were superb in every way, at the initial installation time/point. But every mile driven caused them to get weaker and worse in ride/handling. I decided to remove them before they caused me an accident, as these particular Coilovers were clearly defective and were not worth the safety risk.
Ultimately, I went back to the OEM Kia Stinger shocks and springs as the car was not drivable with the worn/defective KwV3.
Before you buy sways, experiment with increasing the damping a little bit. When my KWV3 were working properly, I was able to tune out most all body roll simply by adjusting the front and rear compression. The car cornered quickly, sharply, and nearly flatly with the damping turned up a bit. Additionally, steering feel improved tremendously. Steering effort went up, was more sensitive to input, and returned back to center more quickly and forcefully than with the regular suspension.
