Tuesday I put in NGK 4177 plugs. they are a cooler plug than the ford platniums. I was hoping tby changing the plugs i could get better times....WRONG!!! Not only does the computer not know what to do with them i FEEL the power loss difference. I not sure on HP numbers but it it a difference. hey JB when I put the plat's back in maby we can do it again. That might have attributed some to that spanking i took.................