Well...I can't say that it is as of yet. But then I have about 500 miles on it, all street time, and have really tried to strech it out yet so I guess I should reserve opinion until I get to. I will say it ran fantastic before and it runs well now. The changes I made should effectively move the power band higher in the RPM range( an area that I don't normally get into on the street). I like the difference between the headers and the LBs. It may take a track day for me to realize the difference. I still have to take it back to the dyno and that will give me some hint as well. It's funny but I didn't think I would miss the low end torq as much. At least I'll save on tires.