When to change plugs?

[snakebit]

How frequently should one replace the iridium plugs w/ a FFS coldside? I've been running a set of slightly used ones for over a year now and no noticeable loss of performance.

[bogey]

Good question... I have over 20K on my original set.

I assume the plugs last about the same as any other plug. 50K, 100K, ???

The plug wires are far more frequent... 20-30K.

[Tom @ Fast Forward]

On the base 190/200 WHP system, they should last for 10s of thousands of miles.