You get the rally whoosh typically when you upshift, not downshift. You cannot fit a BOV to an Aero without causing the CEL to come on, and in some cases stalling the engine at idle. You can get a cone airfilter that will let out some noise. But I have one on my Viggen, and the noise is rather sedate at best.
You can always try a Forge TWIN piston ram style dump valve and see if it works for you. But can't gurantee it will, and it would almost definetly void the warranty should a claim be made.