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Old 03-07-2004, 06:58 PM   #1
Wombat North
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Default 2.5 STI spark plug pics here

For those of you who don't know here are pics of what our stock STI plug NGK IFLR6B looks like against the commonly used NGK BKR7E1X 1 heat range colder plug used on modded WRX's.

The BKR7E1X for comparison is the same size as the stock wrx plug.

A bit of difference eh! Now where can we get colder STI plugs, me thinks at this time we're hooped. I've called the normal web plug vendors etc.

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Old 03-07-2004, 09:05 PM   #2
2003 sedan
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Yeah the STi plug extends deeper into the cylinder for sure.
You sure don't want the short threaded plug in that cylinder head(I know you don't).
The heat range difference can usualy be seen by the porcelain length.
I was doing a price check with a vendor the other day and the Iridium plugs were about half the price of the Laser platinum.
Just thought I would share.
Dwight
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Old 03-07-2004, 10:40 PM   #3
Monsito
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Did you pull that plug from your STi? It does not look like a happy plug. It looks a little glazed. How many miles do you have on your car?
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Old 03-07-2004, 10:41 PM   #4
Wombat North
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Quote:
Originally posted by 2003 sedan
Yeah the STi plug extends deeper into the cylinder for sure.
You sure don't want the short threaded plug in that cylinder head(I know you don't).
The heat range difference can usualy be seen by the porcelain length.
I was doing a price check with a vendor the other day and the Iridium plugs were about half the price of the Laser platinum.
Just thought I would share.
Dwight
Thanks
Any vendor you talk with carry colder ones

I posted these pics because just a few posts down is this
http://forums.nasioc.com/forums/show...hreadid=459809

Some are going to be in for a surprise
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Old 03-08-2004, 05:00 PM   #5
Kenneth2000
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Good Info, thanks for posting that ... I'm just ordering a set from the dealer for now .. hopefully, someone will figure out what a heat range colder plug would be for our STi's .....

Like maybe a Denso or something ....
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Old 03-08-2004, 07:00 PM   #6
mr2guru
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Wonder why it goes into the bore like that?
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Old 03-08-2004, 07:54 PM   #7
Wombat North
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Quote:
Originally posted by mr2guru
Wonder why it goes into the bore like that?
I too would like to know. By the looks of the plug it sticks into the combustion chamber by a few threads?
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Old 03-11-2004, 12:02 PM   #8
byroll01
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I can't believe that anyone changing their plugs wouldn't notice a difference that BIG!

Thanks for the info I was about to drop the cash on the colder plugs. I would've been pissed!

Keep us informed when there is a colder replacement available.

byron

Last edited by byroll01; 03-16-2004 at 02:18 AM.
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Old 04-20-2007, 02:33 AM   #9
STI30G
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my car keeps misfiring and i cant figure out why? Then i compared my plugs and stock from one step colder is a huge difference? What plugs should i use in my 2004 STI?
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Old 04-20-2007, 02:40 AM   #10
mathetes
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holy 3-year-old thread batman..

you can use the ngk bkr7e1x a step colder or bkr6e1x for same heat range
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Old 04-20-2007, 11:18 AM   #11
x99percent
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Quote:
Originally Posted by mathetes View Post
holy 3-year-old thread batman..

you can use the ngk bkr7eix a step colder or bkr6eix for same heat range
NO.

Those are plugs for the WRX, and they are too short for the UDSM STi.

As noted in the first post, the stock plugs are NGK ILFR6B (note: 26.5mm reach). One step colder replacements are NGK LFR7AIX (obsolete NGK part, but sparkplugs.com still has some).

Edit: A new part number is NGK ILFR7H ... these should last longer than the LFR7AIX, as they are in the same series as the stock plug (meant to last).

Last edited by x99percent; 04-20-2007 at 11:38 AM.
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Old 06-18-2008, 10:09 AM   #12
Jitenshakun
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According to NAPA all spark plug numbers are changing and given the scarcity of the new plugs you may want to go with the old ones for now.

NGK one step colder plugs for your STI

LFR7AIX = 2309
ILFR7H = 5245

-J
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Old 10-03-2008, 06:27 PM   #13
eb_rat_7
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does anyone know if the ILFR7H or LFR7AIX will fit an 2006 wrx 2.5L? also, what is the difference between the two?
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Old 10-03-2008, 06:43 PM   #14
gtasti
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pics dont work btw
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Old 10-03-2008, 08:21 PM   #15
vinceGC8
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Quote:
Originally Posted by gtasti View Post
pics dont work btw
pics dont work cuz the original post is from over 4 years ago.
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