After the many months waiting, I have a few more days to wait.
It seems the Magnaflow system was NOT made for the Convertible
We found out when we placed it up to the current exhaust and it didn't quite match.
Called Magnaflow and they said it was ONLY tested on the Sedan and Coupe; NOT the Convertible. Claim the information is on their WEB. I checked and it did NOT say that the Converrtible was excluded. Even printed the latest instruction sheet and nothing was mentioned about the Convertible being excluded.
So my choices are to return it and find something else OR get a pipe locally and then install the system.
Going to try to do it.
BUT the BIG question would be, WHY did GM made the exhaust different on the Convertible? Seems like it would have been CHEAPER to use the one from the Other G6/GT 3.5s.