I just tried the Pulstar plugs and I have to admit I was a skeptic especially with the cost. I was quite impressed with throttle response and gas mileage increase. Anyone can pay a celebrity to endorse a plug like many of the so called premium plugs do. This is the only new plug I have tried that really makes me feel any difference. Will keep you posted as time goes on. Oh yeah tried every Bosch made and none of them did anything but turn check engine light on. E3 did the same thing too.