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Discussion Starter #1
So when I was looking for plugs, I found these 2 that seem to fit our cars. In the end though, I ended up buying the HKS M45XL plugs that are 1 step colder plugs (heat range 9). Of course, with colder plugs and running the stock tune, I was concerned about fouling. So 5k miles later on the HKS plugs, I decided to get a set of these Evo X plugs and got the DILKR8B6.

From my quick research on both these plugs, the ILKR8E6 is the original plug Mitsubishi used for the Evo X. But since the 2011 models and up, they switched to the DILKR8B6. Don't know the exact reason behind it but from what I can gather, the ILKR8E6 were fouling and Mitsu decided to start using the DILKR8B6 in their later models (2011+). Don't know how true this is but figures I'd mention it just in case someone wants to do some more research behind them.

Anyways, installed the DILKR8B6, started the car up and started driving to warm them up. After warmup, I got on it and tried to see if there was any difference. Didn't feel any difference but from what I can hear, there was a difference. Idle sounded smoother and WOT above 6kRPM sounded much smoother than the HKS. I might be crazy on this and I highly urge someone else to try this exact plug so they can call me crazy and stupid. Other then that, it runs in the car just fine with these plugs. Also safe to say the ILKR8E6 will work in our cars too.

Of course, figures I'd make this thread since I cannot find a single info on using these plugs in an N. Would be nice to hear more feedback from other N owners using these plugs. The plugs cost $50-ish for the set so much cheaper than OEM and HKS.

Here's some pics of the plugs.
-1st is the HKS next to the OEM
-2nd is the DILKR8B6 next to the HKS
-3rd is the HKS tip with carbon build up around the ring. It's odd to me because the OEM plugs had more of a white-ish coloring around that ring. But of course, OEM plugs had 10k miles and HKS plugs only had 5k so not an exact comparison.
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Just make sure you have the right heat range & plug depth, especially if you have a tuner or anything modified with the engine. Both aspect are very important.
 

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Sounds like the hks are one step too cold for the stock tune. Are the DILKR8B6 as smooth as oem at idle and over 6k?
 

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Discussion Starter #4
Just make sure you have the right heat range & plug depth, especially if you have a tuner or anything modified with the engine. Both aspect are very important.
Yeah that's what I didn't like about the HKS M45XL. It's a step colder than the OEM's #8. Everywhere I read, it was recommended in our cars by tuners and other owners so I decided to buy them. Ran them all of fall and winter just fine. Didn't feel much different from stock other than it sounded differently. It's was just that lingering feeling of having the wrong heat range plugs in my car that prompt me to get new plugs.
Sounds like the hks are one step too cold for the stock tune. Are the DILKR8B6 as smooth as oem at idle and over 6k?
The stock plugs are #8 so the M45XLs are a step colder at #9. In terms of feeling a difference in smoothness, I didn't feel any. Since i have an AFE exhaust, I can hear more of the car and it sounds smoother. The M45XLs always had this tiny hesitation from idle to over 6k. It was weird because the car never misfired and never drove any different compared to OEM. Also dropped a few MPGs but I'm faulting that on winter since I changed it right before the season hit. Either way, I have to put some miles on these plugs to see a difference in MPGs, driveability, etc. Will report back after 5k-6k.
 

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If you're not running a tune or separate tuner, you don't need them.
I am hearing two things:
  1. Get NGK Heat range 9 (colder) spark plugs IF you have a tune, piggyback, etc. (i hear this most often)
  2. Get colder spark plugs IF you have mild to extensive bolt ons (only from genracer)
I have the NGK R2556 racing plugs but at the stock heat range since im "stock" but on genracer it is essentially saying colder is ideal for mild to extensive bolt ons. I'd say my catless straight pipe set up is quite mild :) I haven't installed the ngk heat range 8racing plugs yet :eek:

On GenRacer's site:
The HKS M-Series Super Fire Racing Spark Plug has been developed to provide your vehicle with smooth acceleration, and improved performance throughout the entire RPM Range. These spark plugs are a #9 heat range, and are an ideal spark plug for those with mild to extensive bolt-ons. With iridium technology, the HKS M-Series Super Fire Racing Spark Plugs will provide enough spark energy and performance for spirited driving, or the occasional track weekend. If it’s time to maintain your vehicle with a refreshed tune, you should include the HKS M-Series Super Fire Racing Spark Plug to make sure your car is running at optimal levels.


NGK R2556G-8
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