My Stratmosphere Hyperboost DV sound is much more distinct that the OEM valve. Especially since I did and airbox mod yesterday (carved out the base and fenderwall sections) and replaced the air filter with a drop in K & N. You can really hear it dump between shifts. The intake sound is cool too, but not as deep-toned as I hoped. Thought I'd try the airbox mod for a while, may still do the Modshack or Neuspeed P-Flow.