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why has my bov`s gone quiet???

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I have two dump valves fitted to my zed (i know theyre not to everyones taste), when i first fitted them they were really loud, then they started to quieten down a bit only being loud when the weather was dry but cold. And now, since i have had a decat exhaust fitted they carnt be heard at all....


whats causing this?


Are the valves crap? Or can i make them noisey again by doing something else to the car?


Cheers guys

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