I work for checker auto and have sold a couple of sets of these Pulstars. Same customer put them in his 06 Infiniti FX35 and in his 1984 Chevy 350. He told me in his FX he saw a jump of almost 30% gas/power but in his Chevy he got 2 days and then straight misfires. He returned the ones for his Chevy but is die hard about them in his FX. I don't know if that helps any but he feels that imports enjoy them.
On another note, i have used the E3 plugs in the P5 and they don't seem to be really any worse, but they are definately not any better.
And last off, I would never use a bosch plug in anything but a Euro, and even then I would probably switch to NGK.
On another note, i have used the E3 plugs in the P5 and they don't seem to be really any worse, but they are definately not any better.
And last off, I would never use a bosch plug in anything but a Euro, and even then I would probably switch to NGK.