I'm guessing that the people that didn't notice a difference either did it incorrectly or have a hearing problem.
I did it by disconnecting the plug inside the trunk and the sound difference is night and day from 0 - 3000 rpm's.
If you like it or not is up to you, but the difference is dramatic.
I love it and I constantly get compliments. Some people have even asked me if I have a performance exhaust.
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