No not yet, i use 91 octane, and the top end Im currently running is past due for a rebuild, its only producing maybe 75-80 psi, I think that's not enough pressure to detonate. I'm not sure if I'm gonna run a timing advance when I rebulid it though, the risk probably outweighs the rewards lol. Have you heared of someone running into detonation with the rechambered head and timing advance combo?