Oh, in case I wasn't clear... I have the Magnaflow on SPIRIT, which was the prototype car used to develop and test that offering. I saw the whole process as it was being done at the Magnaflow research lab just down the street from my house. You can read all about that process here:
Magnaflow Monster - 3.0 Cat Back for Red Lines, Close-up Photos
I could not be happier with the finished result.