So I needed to get some new plugs for my mostly stock (turbo back and Perrin filter) 9. Oriely's got me the stock NGK ILFR7H ordered and to me in 1 day, and they price matched Rock Auto @ $9.63 a plug vs $12.50 which is what they normally sell them for. Just a little tip to save some money on already expensive plugs.

 

just so everyone knows if you have a Bumper 2 Bumper local, they definitely carry the Denso plugs the cheapest, at $8.88 a piece and keep them in stock.

 

Definitely a good thread. A lot of good information.

 

I have an Evo IX with a turbo back exhaust, intake, and ic piping. Basic bolt ons. What would you guys recommend on brand/gap?

 

Denso ILFR7H gapped between .020-.024, it is the stock replacements and the only plug/gap I have ever used and I make over 400whp on stock turbo.

 

Hi, since this thread start in 09 , I was wondering if NGk didn't release any new plugs number for the 9. Iridium
I've been using for more then a year bkr8eix(1 step colder)(different then the bpr8ex) plugs which ran perfectly. No misfire, no problem.
The thing is I can't find them mentioned anywhere here and I've been told they are not for the evo 9 as they are shorter then necessary. Anyone else used them? Is this a series that can replace the R7437-8? Any feedback will be highly appreciated as I m about to change my plugs now ? Thanks a lot

 

wrong plugs they arent long enough 19mm opposed to 26mm you should have

 

those plugs are i believe in the regular lancer and/or subaru....

definitely the wrong plugs. Im amazed you hadn't had any problems.

 

A while back I was doing a frantic weekend of work on the evo before a road trip and tune (clutch, flywheel, ic pipe, ported manis, spark plug change, O2 housing ect...) And I ordered the plugs for the 8 off MAPs website. They arn't clear at all on there. I didn't even try them due to the size difference. But I had one cracked stock plug! So I had to put something in... The only right sized plug around was an autolite. Had to tune on it the first time... tuned again a few days later on the correct stock NGKs and made 9 more HP and had less problems. Much smoother with real plugs.

DONT USE AUTOLITES!!!!!

 

i really had no problems at all with them ... worked perferctly .. from what i understand now i need to retune everything specially AFR for the new plugs... i m gonna use standard OEM plugs that came with the evo 9. should be enough for me since i only have air intake, TBE and a remap with MBC.

 

Whats the deal with the Denso IKH24? I have an IX with basic mods, TBE, intake, looking to get tuned to around 25 PSI approximately 330-350 WHP. Should I get the Denso 1 step colder or stock NGK?

 

great thread, just swapped out to new oems. All this info will come in handy when I start piling on the parts.

 

Great info! Very helpful, thanks.

 

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I just ordered these, will let you know Saturday how they turn out.