Tailpipe options for 90 GT

Hi all.
I'm researching tailpipe options for my 90 GT, and have discovered
Flowmaster now makes one thats 3 inches diameter for my car. This
interests me, but will I encounter any fit problems?
I'm guessing some sort of adapter would be placed between the muffler
(2.5 inches) and the 3 inch pipes, and they claim to use the factory
hangars and such.
My mufflers are (I think) in pretty good condition, but I'm not opposed
to replacing them if necessary for the pipes.
I was gonna contact Flowmaster about this, but they don't take tech
questions by email (and phoning isn't convenient for me).
Therefore I once again turn to you, and welcome your experiences and/or
advice.
Thanks very much, and best wishes.

Randy

We're living in a world that's been pulled over our eyes to blind us
from the truth. Where are you, white rabbit?