oops, i didn't notice.

 

Since you dont have much mods done, replace and stick to the stock plugs. Also gap them to about .26. Spend some time under the hood and check for any vacume leaks(boost leak test). Oddly enough I had this problem in a friends car. After boost leak tests and spark plug changes we found out it was actually a bad BOV.

 

Start with easiest (and cheapest) solutions first. Plugs, then wires, then tune if necessary.

 

get a tune, your cars slow anyways

 

tune ftw

 

tune, and check for leaks

 

First off, stock iridium plugs are too expensive (waste of money). Get yourself some NGK Copper Plugs BPR7ES (Model 5534, used to be 2023). Gap them to .026 and you should be set. You will have to replace them more frequently (6k miles / every other oil change), but they are cheap enough and it only takes 15 minutes max to change all four. Of course, check for boost leaks as well. Tune comes last, not first in this process. Good luck.

 

and for the record, when measuring in more precise units, millimetres is far more accurate.

 

OP, whats the update on your issue?