So, I have searched this out and have done a lot of reading on this topic but in the end i'm still on the fence if this actual performance gain or is it a remedy for idle issues and the rich smell. I did not see any dyno draphs of an A/B comparison of the timing change only. There are a few " that felt better" posts but is it real? I cant get me head to wrap around seeing any big gains in the upper rpm region but I seem to think there may be something to be had at part throttle cruise conditions. I would appreciate some feed back in the regard, does anyone have a dyno sheet with the change and if so can you post your results. Or feel free to chime in with your thoughts, thanks guys.