I recently desnorkeled my stock 02 S after 3 months of ownership. I would say there is zero butt dyno difference. However, the sound is definitely more robust. That initial "gulp" of air as the throttle body opens is clearly audible now and overall volume at full throttle is increased. Off throttle and cruise throttle there is no discernible difference.
In hindsight I really should have taken my DB meter and done some tests.
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2002 Boxster S Meridian\Boxster Red 6-spd
2006 Audi A3 2.0T Arctic White\Beige DSG
2010 BMW 535xiT Alpine White\Natural Brown
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