Thanks GA I am pretty good at tuning engines, I have been tuning RC car engines for about 10 years, and I would assume planes are similar, but for the price and performance of a super tigre you cant beat it, geez 100$ for a screaming engine and at a cost of just having it tuned correctly and broken in well is well worth the price savings as I also heard they will last a lifetime. And they have been around for what? 30 years or so now? I do not know about how long OS has been in the game or saito but for my 4 strokes I have all saito golden knights and wont buy any other brand for the 4 strokes....And they just look dam cool with those gold heads LOL......Thanks for the help, you helped me make up my mind as to what to put in my next plane the reactor .46.