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hmmmm wonder if its worth £50 odd quid, would be tempted if it improved induction sound, got a cheep piperX Viper so i just want things to sound nice really, will be removing the acoustic valve too soon enough, infact may to that at the weekend
If you have a piperX cone filter then removing the acoustic valve with do nothing mate. The acoustic valve iirc will only work when part of the OE sealed system. I may be wrong
As for sound the hillpower bend wont add to the sound at all. All it does is give a smoother airflow and therefore allows slightly more air into the throttle body.