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Helo, I just came across something which I have wanted to know very long ago...

Why cars like Evo or Wrx... When their boost comes n change gears, we can hear the sound from the blow-off valve... It is because they are turbo-charged engines right??

As far as i know, Volvo S40 also turbo-charged engine isn't it? Why they dont have blow-off valve sounds ar?

shoot me :shocked: if my question is stupid..
cheers

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