i highly doubt you'll find any info on " how loud it is". i doubt anyone is going around measuring db's of the turbo.
Edit: and you owe me a beer for my patience.
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2007 wrx intake / tbe / tuned via romraider - 13.2 @ 101.
1/12/09 installed GM bcs and a retune - hoping for 12's 
4/4/09 ran a 10.6 @ 95mph at centerville (1000ft track )
12.9@103mph 5/29/09  |