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Best spark plug for FBO
2015 435i/50,000 miles
I am FBO but without tune. I plan on tuning soon in a month or two.
Which spark plugs should I run? I'm considering putting the bmw branded Bosch spark plugs since the car has been running fine with them prior. I hear there are NGK alternatives as well.
For my situation where I'm on the cusp of tuning but really need to replace sparks what's best recommended?
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