An aftermarket recirculating Diverter Valve (DV) typically holds boost better than a stock DV. If you are running standard tune, then it's not really worth it, unless your stock DV is failing and you need to replace it. If you're after some extra sound perhaps consider an aftermarket air filter, a pod with a heat shield / enclosure usually works quite well. There are many manufacturers out there such as CTS, APR Carbonio, Neuspeed, Integarated Engineerinng, VW Racing to name a few....
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