ok i JUST GOT NEW PLUGS AND WHEN I GOT THEM THE GUY A napa TOLD ME THAT i NEEDED A LEAD PLUG AND A TRAIL PLUG. i DON'T HAVE THE NUMBERS OFF THE TOP OG MY HEAD BUT THEY ARE ngk PLUGS. Does anybody know what I am suppose to have. He gave me 2 different plugs. Which one goes on top. I am asking because when I took the old ones out they were the same plugs and now 2 different ones that the guy gave me. HELP!! https://www.nopistons.com/forums/pub...1047683358.gif

There are 7's and 9's .

Use all 9's if you can.

I belive that the 9's are the trailing plugs.

yes normally they are 2 different plugs. Although some people run the same. On the Ngk plugs they are marked L for leading and T for trailing. I cant recall right now how they go in but you can check out www.iluvmyrx7.com and they have the oem repair manual there. Should take 1 minute to find. Sorry man its been a really rough night and im in a daze right now. https://www.nopistons.com/forums/pub...IR#>/bigok.gif

Leading (have a 7 in the part#) go on the bottom, trailing(have a 9 in the #) go on the top

BUR9EQ is a colder plug needs to go into trailing..

BUR7EQ is a hotter plug needs to go into leading..



i would suggest running all 9s non platinum if you are running more than stock boost...

use all 9's https://www.nopistons.com/forums/pub...IR#>/bigok.gif

for a fd run all 9's



good luck, its less confusing with all 9's anyways! https://www.nopistons.com/forums/pub...IR#>/bigok.gif

Why should you run all 9? What is so different about the seven? But you guys are right cuz when I pulled them out both of them are 9!! https://www.nopistons.com/forums/pub...>/rolleyes.gif

9's have a better spark.

the difference between the two plugs is their heat range. the 7 is a HOTTER plug (because it does not have as much insulation around the plug) . this plug will not be able to perform in a hot running engine as well as a colder plug. It will also not be able to transfer as much heat as a colder plug can. The 9 is a colder plug because (you guessed it) it has more insulation. it can run safley in a hotter engine and retains the ability to extract heat and not melt. hope this helps some??





the rotary is a pretty hot engine, so cooler plugs will be welcome.