I haven't bothered to follow the link as it didn't really interest  me.  
What I do know is that my Sprite is race legal for noise (100DBa at  the half 
metre test from the exhaust at 4,500rpm - goes up to 102Dba at  5,000rpm).  
 
Also it's quieter with the top down than up.  But, with the top up  once 
you get over 105mph+ everything goes really quiet.
 
Weslake-Monza 1330
 
In a message dated 07/10/2009 17:29:51 GMT Daylight Time,  
billyzoom@billyzoom.com writes:
are both  much louder than 85db
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