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With the added intake roar of my K&N filter and the bark of my M Performance exhaust I don't hear that spooling whine very often. I do hear the delicious overrun burble and occasional turbo pressure dump valve from time to time though. Love 'em.
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Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21)
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