Spark plug NGK or BRISK

NGK Spark plug

I'm currently is20 United 91 octane tune, APR packs and NGK RS7 plugs (one step colder thant oem), gapped at around 0,028'' and car feels solid. No misfire, no EPC. However it honestly feels just like when I was with oem coilpacks and plugs. Maybe now idle feels a little bit smoother.

Pros: solid performance, smoother idle
Cons: similar to OEM
Part number: RS7
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NGK Spark plug

I've seen with a digital tachometer a 1,000rpm difference between a laser brand spark plug and the oem ngk spark plug in a chainsaw. So for me it's what the oem uses is what I put back in.

Pros: oem spark plug
Cons: 1,000rpm difference
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