who using what and why?

 

The BPR7EIX is a higher performance iridium plug than the stock IGR7A-G. According to the manual, the IGR7A-G is supposedly an "8" heat range, so go figure.

For the money just switch to copper plugs. Yes they foul quicker, but they are definitely easier to gap and are cheaper if you change between heat ranges often.

 

Agreed, copper plugs are worth every penny. They're cheap and require you to change them more often but that's a good way of keeping up with maintenance. I use the BPR8ES (one step colder).

 

I use the bpr8es and love them....

 

Can you use these on the IX?

 

denso IKH24 iridiums are 1 step colder for the 9. I dont think theres any coppers for the 9

 

WTF no copper plugs at all for the IX? Is it because of the 26.5mm reach?

 

Pretty much. If you try to run the copper ones for the VIII's then you will have a ton of misfire problems.