I have always ran C14+ in my naturally aspirated 15:1 sb2.2 small block with really great results. This motor sees 9,000 rpms every pass. I am nearly out of C14plus and the track I am running this week does not sell it, but sells C14 and C16. What is the next best option for me to run and how much et will be lost by running C14 instead of the C14plus. I am bracket racing so consistency is an issue.