My previous injectors took a crap on me. They were 40 overs. I just installed my new 65 overs Sunday. They sure do make a difference compared to my older one. Cold starts, hot starts, idle and smoke are excellent with these babies. It's hard to beleive that I have less smoke with bigger injectors and still running the same tuning. I am very happy and can't wait to take it to the track. I definitely beleive it's going to pick up a good bit there. The balance and flow is as good as can be with them being +/_ .7 percent variance.