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I have 2021 bmw s1000rr
I have a alpha racing airbox with btmoto Velocity stacks in it an it is leaking oil any suggestion to fixing it or a way to fix it or got to go back to stock airbox
 

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Yea i rerouted the the crankcase hose to a small catch can with hole in so the air still flow but catch the oil also you can gain bout 3hp from the air box
I think that's what BT had on his bike in one of the vedios but he never explained it, also he has small K&N air filter look alike connected to the end of the crankcase hose
 
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