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I did this ~5 years ago on my 1999 and today I went to do it on my 2000 S. We drilled two perfect 3/4 inch holes and I can't hear any difference at any RPM. I still have my 99 so I looked in and it looks like I had pierced the center pipe in chamber three. As other have pointed out that seems more consistence with the PSE bypassing a lot of the Muffler.
Those of you who are raving about this did you pierce the center tube? I don't want to just keep drilling larger holes in the curved pipes if its not going to make any difference.
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