Quote Originally Posted by matt5112 View Post
Car isn't in boost most of the time.

Thus the correct heat range plug for that engine load hasn't changed.

We're changing the spark plug temp in anticipation of the 0.1% of the time you see boost.

Might misfire on cold startup till it warms up.
I scanned back when I put the new plugs in and never misfired cold start up but I'm assuming you mean for when winter comes around.