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I have a 2020 390 duke that runs a little lean. Can anyone give me the pros or cons of installing a booster plug. Also, where to buy in the US and are they model specific.
 

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I’ve had good luck with mine. It does what it says it does. I checked my spark plug and it looked like it was burning a little rich so I just installed a K&N filter on it to see if I can get it as close as I can to perfect. I haven’t ran it enough to check it yet but it sounds a feels better then it did.
Buy it from there website they ship DHL so I got mine in 2 days.
 
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