I know theres a range of opinion on the subject of 2-stroke engines an I'd like to hear them all. My flying tastes are gravitating toward fast precision aerobatics. I am currently flying a Kaos with a Supertigre .61 but plan to move onto a Dirty Birdy and/or Tiporare. Tuned pipe, rear exhaust, expensive nitro, durability, reliability, are some of the questions I don't yet have answers to.