[PapaLegba]

You are correct and yea iridiums say 100,000 but on my TSX I change them every 50k and each time there is an improvement in gas mileage and engine pick up. I’m a master tech and have owned a 2010 Evo X MR Touring with 400hp as well as a 2012 STI with 400hp and a 05 Lexus IS300 with bolt ons and a 02 A4 with bolts ons and guess what each car I ran NGK laser iridiums an would change them at 30k in my forced induction cars and always made a difference. NGK iridium plugs are thee best plug in my opinion there’s a reason all these auto manufacturers run them as oem plugs the evo and sti both had NGK on diff was the evo came with one step colder and my sti I changed to one step colder. So
To the guy saying they last way over 100k and changing them makes no difference u need to brush up on ur auto knowledge.

Just curious, since you've owned both, did you prefer the EVO or the Sti? Which one impressed you the most from a performance standpoint? Same question, but reliability? Thinking of getting an 08'-09' EVO, but I live in Subaru country. Love to hear your opinion. Thx!

 

[Zave209]

I just bought some ngk v-powers for my 07. at 2 bucks apiece compared at 10 apiece, plus its a copper plug!
nobody stocks it around here, so I had to order them.
back from the dead bump! lololol

I heard them copper plugs aren't good. I'd go for the laser Iridium by NGK

 

[Edgeman]

Do the coil packs need to be changed when changing the spark plugs?

Personally my frugality says nope. If you are worried about them failing, pick up one new OEM coil and put it on the shelf until your first coil fails. If that happens, you may want to buy 3 more and replace the rest.