Hi,
  I just have to chime in here on this, I have a very loud RX-7 (ITS spec 
car) and I have three, yes, three mufflers on it, 2 Thrush Turbo tubes and 
one Walker ultra flo, I believe the reason the rotaties get the "loudness" 
attention is simply becuase of the pitch of the noise, it can be quite 
pircing and downright annoying.... but have you listened to a F440, those 2 
cycle engines have a high pitch too...just different.
  just a thought/prespective
Kurt"Wolfgang"Peterson
CSP/ITS #22 
1984 Mazda RX-7 GSL-SE
and a bunch of old Buicks! 
 
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