Check out this forum http://www.solsticeforum.com you might get some good answers about the exhaust and the sound, you will have to join to get the info and i believe most have used the solo performance exhaust due to the loudness of the Magnaflow in the coupes just do a search and probably get the answers your looking for.
Hope this helps.
Yes, I am already a member of the Forum as well as the NM Roadster club. I joined both as soon as I got my Solstice and found out about both forum and club. Since I am currently out of the country and am assigned for two years, it will be difficult for me to do much but to gather information at this time. But, I would like to get all of the information so I can make changes and improve my Solstice when I have the opportunity. Thanks for the information. It will be very helpful.