Review on NGK 3521 Spark Plug: Enhance Performance and Efficiency! by Gary Christon
When installing, be careful not to exceed the torque
I've installed more connectors on all sorts of cars and I've always found that I can feel the torque. Not with these plugs. Very sensitive to torque. I installed FLTRXSE on a 2019 Harley, the one I replaced broke and they work great. just be careful
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