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[Booster]

When i use the orginal airbox on my 4xv (r1 carbs) it runs very good, but when i use the open air filters it has a lack of power probally because of the mixture not being okay.
Is there somesort of kitt that contains some sort of needle or atomiser or sprayer (im not sure what the right translation is) that can be fitted to the four carburators so that it runs well?

thank you in advance,

Robert