i am in the process of getting all the parts for a major tune up together and was wondering if anyone has used the ngk iridium bpr7eix (or 6) as replacement plugs for their vehicle. i know the stockers are the igra iridiums, but I have to special order them everywhere i go. ive searched, but alot (read: everybody), keeps saying put the coppers in. sorry, no. any input on your experiences would be appreciated. thanks.

 

NGK's are fine part # 4055 (bpr7eix). Denso Ir. part # IW22.

 

Denso IW22 for stock like plugs, IW24 for a step colder. Have had no problems with using the IW22s for some time now.

 

I have a similar question.
Ok, I read up on the Denso, because I am a fan of Denso. Question is, these say for stock boost levels. I assume 22 psi is above stock, what is the recommendation then? Colder range, or hotter range?

Thanks in advance,

 

Why not coppers?