)Sorry but can you tell me more about it?
Its this "ossst" which I'm referring to.
http://www.youtube.com/watch?v=mYEA3i3b3mI&feature=related
As per my previous reply, it is possible the sound that you
heard from the Evo comes from it's BOV, or Blow Off Valve. And as
per the title of your video, HKS SSQV Blow Off Valve EVO 8
taken from wiki
A compressor bypass valve
(CBV), also known as a compressor relief
valve or diverter valve, is a
vacuum-actuated valve designed to release pressure in the intake
system of a turbocharged or centrifugally supercharged car when the
throttle is lifted or closed.A blowoff valve,
BOV does basically the same thing, but releases
the air to the atmosphere.
Additional info can be found here..
http://en.wikipedia.org/wiki/Blowoff_valve