[jetuomi]

actually, I can add, I totally forgot about this:

friends camry 4 cylinder from 92..

base dyno was 98 HP
added pulley and denso iridium plugs dyno was 104
added catback dyno was 108

SO, there was a 6 HP increase by adding a crank pulley and changing 65,000 mile plugs.. conclusion, on a camry, worth about 1 HP total...

I know a mustang might be different, and I know these platinum plugs do great on a supercharged car vs. standard plugs.. so I guess we need a blower guy to tell us the story..