IK16s or IK20s ?

[GXL]

I'm ready to place an order for some Denso Iridiums, but not sure which ones to buy: IK16 or IK20 plugs.

2002 Pro5 with mostly city driving, and high reving every other day or so.

 

[GXL]

11 views and no replies

 

[GXL]

Come-on, guys!! What do MP3s come with from the factory?

IK16s or IK20s?

 

[KzA]

I would say get the 16s...I have read that the 20s are for more of a racing application and can cause some ping if you idle alot, which, since you are in the city, I'm guessing you will..

 

[mazdadan]

I agree with KzA. I would go with the IK16. Unless you are road racing at consistant high RPM's or are running forced induction, there is no need to use the IK20's. Oh yeah...to answer your question, the stock plugs are 16's.

 

[GXL]

Great, thanks for the all the answers!

I wonder why the Denso web site defaults to the IK20s?

 

[KzA]

probably because they are more expensive

 

[GXL]

No, same money for the IK20s. $9.99 a piece.