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Message: <blockquote data-quote="turbotog" data-source="post: 172955" data-attributes="member: 1806">For anyone who wants the whoosh but doesnt want to spend any cash..simply remove the bottom pipe from the standard recirculating dump valve and plug up the rubber pipe. it only recirculates the pressure back into the air filter,as the cars have a dump valve standard.. its just muffled by being put back into the system. ever noticed even without a dump valve, the installation of performance air filters/induction kits make a more audible whoosh (was extremely apparent when I had a K&N fitted to my remapped audi a4 2.5 Tdi quattro!)just as safe as an after market one really and sounds the same..</blockquote>