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Old 11-05-2020, 07:27   #1
Evolover9999
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Exclamation Spark plugs for Evo 9

Hi Guys,

What spark plugs do you recommend for an Evo 9 running around 500 bhp. I am currently running NGK HR8s was hoping to run standard Evo 9 spark plugs HR7s as they are cheap too
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Old 11-05-2020, 14:10   #2
r3k1355
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Stock plugs at that power level? I don't think you'll get away with that
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Old 11-05-2020, 16:10   #3
mlau1294
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Not what you're wanting to hear since you seem to want to move to cheaper ones, but I have these fitted to my 9 running 470bhp:

NGK R7437-8 racing spark plug (NGK 4901)

Why potentially lose an engine over a cheap spark plug..???
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Old 11-05-2020, 16:16   #4
Mark Shead
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I like denso ikh27 or ikh01-27

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Old 14-05-2020, 11:39   #5
Evolover9999
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Quote:
Originally Posted by mlau1294 View Post
Not what you're wanting to hear since you seem to want to move to cheaper ones, but I have these fitted to my 9 running 470bhp:

NGK R7437-8 racing spark plug (NGK 4901)

Why potentially lose an engine over a cheap spark plug..???

Did they make any difference in terms of performance?
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