i have an 06 mr and wanted to change the plugs was wondering if anyone has tried using the NGK Iridium IX spark plugs or should i stick with the NGKBPR7ES. mods include buschur tbe & intake, next will be a boost controller, 255 fuel pump, and custome flash with tuning technologies in Colton, CA. thanks

 

If I'm not mistaken other than the stock iridiums only HKS is making replacements.

 

well i found these on ebay and didnt know what to get
http://motors.search.ebay.com/evo-sp...saprcloZQQsofi
just dont know what to get. i wanted to get colder plugs if it was safe

 

The IX spark plugs are not the same as the VIII. Do a search.

 

cool found the post it states the NGK LFR7AIX & NGK ILFR7H will work for the IX's and run about $8 each. attached link in case anyone else might wonder thanks ray3328
https://www.evolutionm.net/forums/sh...um+spark+plugs

i think NGK LFR7AIX are better. correct me if im wrong

 

greddy now offers plugs for the IX but probably not worth it. which plugs are you guys and gals running NGK LFR7AIX & NGK ILFR7H

 

go with the NGK plugs that r one step colder than stock. If you call AMS or Buschur, i'm sure thats what they'll tell you. my buddy has a IX and went with NGK one step colder.

 

is there something weird about the plug size on the IX's ive always run NGK coppers in varius heat ranges on my cars depending on mods im assuming they are readily available for the IX?

 

yes the IX has a longer plug

 

damn mitsubishi wants $25 for each plug. i will look else were for IX plugs

 

which ones are the plugs for the evo IX that are one step coldeR?

 

i can get the stock plugs from mitsu for you at 60 for the set.

 

HKS Part number: S40iL
OE NGK number: ILFR7H

Stock Plug= NGK ILFR7H Stock #5245 LINK
Step colder= NGK R7437-8 Stock #4901 LINK
2 Steps colder= NGK R7437-9 Stock #4654 LINK
3 Steps colder= NGK R7437-10 Stock #4655 LINK

NGK ILFR7H (OEM) Iridium
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=20451

NGK LFR7AIX Iridium
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=16602

 

so the ngk r7v37-8 is a copper step colder?

and the LFR7AIX is stock heat range but iridium?