I've never heard a GTSi/GTBi 2V with a Tubi, but I know the stock system is "disappointing". I had a local muffler shop modify the existing pipes to work with a dual-in dual-out FlowMaster, and it is loud! But it also sounds fantastic as it revs! It has quite a rumble at idle but then really turns mental as the revs rise! About 5500 to 7000 rpm it really screams like a Ferrari should. Its a lot cheaper than a Tubi, which I'm sure are fantastic systems but very spendy as well. Maybe a flowmaster is a little agressive, or loud but... I'm sure MagnaFlow has a muffler that would work as well. Just my 2 cents... Good luck!
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