Im getting a retune done this week. I ordered a better set of plugs and wires but they wont be here until next week sometime. Will changing the plugs from NGK Coppers (what I have now and for the retune) to NGK Iridiums do anything to throw the retune off?

 

unless you are changing heat range

no

 

The iridium plugs are just slightly better than the copper ones. I wouldn't worry about it.