Strange Sound?

MS3 Swag

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08 Mazdaspeed 3
After installing my Sure TIP i noticed the forge bpv is alot more audible, but i also noticed a strange sound right before the clink. its sounds like a odd whoosh. i want to make sure its not compressor surge or anything bad. btw its just cobb sri with the sure TIP, forge bpv has blue spring and one shim.

Here is a clip, listen and let me know what you think. Thanks.

http://youtu.be/Y97JnnRtS8U
 
That is definitely normal. When you change the stock intake system to an SRI, you will hear more air sounds and the bpv will be more pronounced.
 

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