Since the iridium is supposedly better material then platinum will these be the last plugs I put in my truck? I can't stomach changing $90 spark plugs every year. Anyone have any idea how long these are supposed to last in boosted applications? I also have a 4lb lower.

 

I have had 2 sets of Denso's in my truck already. Its all in how you run your truck, your tune, and your gas. If you use additives they will not last as long as using liek a race gas. I wouldnt leave any plugs in your truck over 10-15K with higher boost levels....

 

$90 a year IS cheap insurance

 

Yes it is.... I like the Denso's alot. NGK's are ok, but seem not to last as long...