Smackover recomended the left one to go down the right one to go up. . I run the left down and extra long with the end folded over and ziptied. I then can pull it out remover the ziptie and let the pvalve spooge drain out. The right one I run up under the tank with a little bolt in the end of it. The bolt is tight enough to prevent any splashes from running down the tube but loose enough to let the right side exaust what it need to. My 07 that was given the once over by a factory mechanic has them both running down similar to what 2 stroke has his.
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