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Moroso makes a grommet for air breathers that has a built in baffle. I've bever used one, so i don't know how well they work. If you get one let us know the results.
heres what i did, searched on jegs and summit, looked at pics of the baffles they sold.
so i made one out of sheetmetal, its the width of my cover and about 9 inches long, about 3/8 inch from cover, works great, no oil spewed yet!, and i have done some high r runs today...
btw, i sanded the cover and used jb weld to hold it on, i tugged on it and everything, so i know its stuck.