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it ranges from a subtle PSHHHHHHHH at low rpm, to a louder PSHHH SHH SHH SHH SHHH at mid rpm to a really loud PSSSSHHHHHHHHHHHHHH SHHHH SHHHHH SHHHHH SHHHH. It pulses when its letting off alot of boost.
posted by 69.70.69...
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