What purpose does the acoustic valve have on the cold air feed on the std airbox?
jimmy_b 2004 clio 182 ff Jun 26, 2014 #1 What purpose does the acoustic valve have on the cold air feed on the std airbox?
DaveDreads aka Philomena Cunk aka Barry Shitpeas ClioSport Club Member Golf PD130, 172 Jun 26, 2014 #2 Reduces induction noise to fit in with EU regulations.