This turned into quite the wtb thread! I was not so much concerned about the piping size change, and considering the two axle backs in question were known to produce good power, I wasn't worried about them being a bottle neck. I found a thread stating dyno results from a ProDrive/Turbo XS stealth back system in comparison to a stock STI axle back with the TXS seeing similar numbers, negligible drop. My main concern was dropping a half inch at the flange with no transition.
However, swapping my axle back is no longer an option, I don't believe anything larger than the Invidia can muffled will work with my new setup.
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