I havent realized why my car was slightly not as fast as before. I came to realize maybe the spark plugs i got were the wrong ones, i hear somewhere on the forum that the iridiums are a colder plug and should be used when running nitrous or FI. when i had my platinums (OEM) plugs, my car seemed faster than when i was stock. does it make much of a difference or is something else wring with my car. does anyone have any input on this, it would really help.

 

You're speaking of the heat range. Each manufacture has different plugs with different heat ranges, and it has to do with other components rather than the Ir. Find out the heat range for those particular plugs you've got and then decide.

 

the platinums i had before were the BKR5?? and the iridiums i have are the BKR5EIX, they both have 5 which is the same heat range, but gauging from what i hear from others, they are not, not too sure if this is true or not.