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Old 10-05-2010, 12:18 AM   #7
GrinderSS
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Drives: IOM 2SS/RS
Join Date: Jun 2010
Location: Florida
Posts: 539
Quote:
Originally Posted by mikeSS View Post
i have corsa also ..i still don't understand how they do it.. i would really like to know if somebody can tell me. why nobody can do what they do
They use the same Helmholtz technology I mentioned; basically the sound goes from the exhaust pipe into the channels inside their muffler, where it bounces back/reflects 180 degrees out of phase and cancels out the sound with the same frequency in the exhaust pipe. The length of those channels determines the frequency of the sound that it cancels. I suspect they have channels of varying lengths so as to cancel out a range of drone frequencies.

Other companies don't do it because I doubt they actually do much actual design on their systems. Even Borla, who claims to do all kinds of R&D has serious drone problems with some of their systems. Their R&D focus has been on exterior sound primarily I guess.
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