Turbosmart has lifetime warranty on their products. Talk to the mfg (not the sales/distributors) to see if they can help you out. From what I hear, recirculation has fluttering noises more often than atmospheric bov's. I am guessing that your spring tension is somehow messed up. If you don't like your bov, I'll take it off your hands for you if you'd want. Email me & we can work out a price.