Interesting. Where to try for dyno?
So, these iridium, platinum plugs are just plugs with longer lifespan that doesn't really affect performance at all? The last time I changed my plug for a new set, the car felt slightly more responsive and engine seems to operate smoother.
Not that it doesn't affect performance. If you compare dyno graphs, you'll see less spikes and a smoother graph. That's all. No higher torque or higher HP or whatever. Just smoother lines and possibly better combustion so cleaner combustion chambers?