Its convenient to use as it plugs inline with the factory connectors.
Having the set screw makes it more useful as you can tune it to your car.
Some people might leave is set smokey so they can be special(lol) and get noticed
or is it go faster , I'm not sure what the point is.
Also this cheap type of tuning box does not work well on gasoline motors ,the results would be disappointing.
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Ride a Mtn bike for errands exercise entertainment and outright fun
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