That's an interesting question, and we weren't sure either, so I called VP directly and told them what we built...

They recommended X14 for NA bracket racing and I had been running C12 which he said we are right around the limit on....So all I had with me was C12 figured I would get some X14 at the track and mix it 50/50...

Well, all they had was C16, which is what I ended up with, and I mixed that with C12 50/50....All I will be running from here on out will be C12 as it doesn't seem to care either way.3333