i believe initial-t is right, i just checked the toyota australia muffler on their website. and to me in my opinion, it looks like a stock muffler and all they did is add an exhaust tip at the end so it just looks a little bit more "classy/sporty." since on their website they mention about it being having a little 'bit more tone' with the tip screwed on to the muffler. in my humble opinon, it's kind of like buying in the US an autozone/pep boy's or something exhaust tip to have that tone or something.
in our trd muffler in the united states, our's is in a stainless steel more of a shiny muffler all through and they weld different components i guess. and it looks quite slightly a tad bigger. but of course the exhaust tone is a bit louder since they mentioned it's 95db or so? in addition to that there's an increase of 3hp+ to anwhere around 10% or so *which varies on what type of setup is done and so on.*
sportivo muffler
trd muffler
there's the image... the sportivo muffler kind of looks like the SE muffler here just with the stock exhaust chrome tip?