I know if its a brownish color on the tip its cool but these are white. I know every color and everything means something. I appreciate any responses.

 

Also since installing my iridium ngk plugs. I noticed my boost holds 22 to redline instead like before it would spike at 22 and hold 21/20.

 

White means your running too lean.

 

unless you have a means of cutting off the motor right after a high speed run I don't know how you can judge plugs. In the time it takes you to get back to the garage, you have changed the plug from it's high load state.
computer,(FI) cars really run lean during no load vacuum, vrs a carbed car that might run way rich at no load or idle.

fwiw that's the way I'd like the plugs to look. but as I said it means nothing.

 

The ecu tries to keep the a/f ratio as close to 14.7 as possible at no load for emissions reasons. 14.7 is not very lean at idle. but a lean misfire for example will turn plugs white. It does not mean the car is running lean all the through the rev range. Just at certain points in the rpms. Lean misfires are bad. And would not want them to happen to me.

 

coasting down a hill, high vacuum the afr will go up to 16 even 17 on a oem ecu...

won't any running lean tend to "clean" the plugs

 

that looks like your afr is at little over 11.8.

mine used to look worst than that.