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!!

 

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.

 

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

 

for a fd run all 9's



good luck, its less confusing with all 9's anyways!

 

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!!

 

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.