Yes, this is normal. The noise you hear is the blow off valve redirecting boost pressure to the compressor wheel when the throttle closes. It is one of the joys of owning a turbo car. Believe it or not, some people might not want to hear this, thats why dc put them in.
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90 Eagle Talon Tsi AWD - 300 Hp -K&N, 16g turbo, JE pistons, 3in Turbo back exhaust, mild port&polish
03 PT Cruiser GT - 215 Hp-Airbox and Intake pipe silencers removed
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