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There is a sensitivity setting for aftermarket knock systems. The oem tests for thousands upon thousands of hours to fine tune their knock systems with respect to gain on the signal and to tune out phantom noise. Even with all those engineers and hours, you still hear new oem vehicles knocking in traffic, going up hills, you name it. This because they're tuning for strict emissions. In the aftermarket tuning world, you're usually going for performance first not emissions so you have more flexibility to tune away from the knock limit and focus on power output.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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