The only thing I would say is many people order their exhausts for their 370's and think its not going to be very loud inside the car. I thought this same thing as I had previously owned a full Fast Intentions setup on my G and thought it'd be very similar on my Z from inside the cabin(barely heard, many times wanted it louder yet everyone that followed me said it was very loud/deep). The Z is a complete 180. The inside of the Z literally has NO sound deadening, which you hear evvvvvery single thing outside the car, especially the exhaust.
With that said, I'm running Resonated HFCs with a NONresonated fast intentions catback, and its pretty dang loud. I can't even imagine how loud the GTHAUS set would be inside the car on the Z. The GTHAUS setup is easily 20-30% louder then a Fast Intentions setup.
(not sure if this plays any role of your decision, but definitely something to consider)
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