Spark plug NGK or AC DELCO

NGK Spark plug

Personally I’m running EQT’s stage 1+ tune and I just went with the recommended plugs (NGK 4905s) for peace of mind. I think it’s worth the extra couple bucks for my sanity

Pros: peace of mind
Part number: 4905S
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NGK Spark plug

The NGK plugs are like $8ea when you buy 16. Still costs you nearly $800 less than what the dealer cost for that job is. And they last 60-75k miles.

Pros: last 60-75k miles
Cons: pain in the ass
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NGK Spark plug

I stopped buying plugs from eBay and Amazon years ago after getting what I can only assume was a bunk set for my BMW. They looked the part, but caused the engine to run rough.

Pros: looked the part
Cons: engine run rough
Vehicle: BMW
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