That's normal with a strong BOV. You can't drive like that with part throttle and partial boost unless you have a weak BOV. You just have to learn to drive differently with an Evo. The Greddy RS isn't a great choice either, but this particular phenomenon is not specific to the Greddy.
Tim, do you mind fixing the spelling of Greddy (not greedy) and removing those question marks? Thanks!
I know people who have done the single spring mod with the type-rs also, and have had great results. I have the type-s with the small spring removed (as displayed by the evomoto how to) and the bov does not flutter no matter what.
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