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Sounds very similar to the noise a fd will make while under boost and one of the metal y pipe gaskets is a little loose between the ypipe and turbos because it isnt tightened all the way, never heard it while revving a car up though.
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David Jerome
Broker for Speed For Sale LLC ( David@SpeedForSale.com)
(Pre-owned RX7/sports car sales & new parts sales/installs/tuning)
PM me about low priced, high quality port work 
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