No leaking for me. Make sure you have the white spacers in correctly and used slime on the rings.

I have the K-rings but haven't installed them yet. I was told by a team driver that they swell more than the stock rings, even with slime, so I haven't tried them yet. The middle spacer would have to be shaved a little bit to compensate, but I didn't want to risk leaking when they weren't swollen.