Quote:
Originally Posted by Barry9020
Hey guys i actually purchased a 2016 550i myself and was hesitant on getting the jb4 only bcuz i was hearing i might need to upgrade sparkplugs or i might expierence misfires. Is this true or should i jus go ahead with the purchase of the jb4?
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With more air and fuel packed into the cylinder with increased boost, the mixture gets harder to ignite. There's always a chance your spark plugs could be on their way out and running the JB4 will show you that. Many of us ran the JB4 for a long time without replacing anything.
Just have a code reader ready so if you do start experiencing misfires you can tell what cylinders they occur on and then start diagnoses (usually the coil goes first).