CPU VS. GPU: which should i upgrade to make BeamNG smoother?

I have a pretty decent graphics card and processor, and they work well together. The can't run everything at 60 on ultra, it works for most of my games. But, BeamNG is a pretty hardware-intensive game and seeing as I haven't upgraded in a while, I was hoping I could get BeamNG to run at a stable 60. What I would like to know is what would give me more frames per second at normal quality: a better graphics card or a better processor.

I use the "normal" quality preset and it normally says...

CPU VS. GPU: which should i upgrade to make BeamNG smoother?