NGK Racing series spark plugs for Evo 9

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Sep 27, 2008 | 05:23 AM

#16

brandEvO

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Joined: Jun 2008

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From: Panama City, FL

Autolite APP3924 is the replacement plugs I have.

Sep 27, 2008 | 06:37 AM

#17

boostedwrx

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From: Seattle, WA

These cars go through copper plugs fast, not iridium plugs.

Feb 1, 2009 | 12:40 AM

#18

Ameen77

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Joined: Oct 2008

Posts: 29

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From: Location

Hey guys,

My experience, put 2 steps colder: lower performance and coughing at high RPM and high boost (22.5 psi). i think the spark plugs are the reason and i will change to 1 step colder...

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