2006 Impreza 2.5i Wagon - Size of stock muffler?

[MACE]

Planning on getting custom made 2.25in cat-back exhaust, probably
gonna get a universal performance muffler(unless someone can recommend
a decently priced muffler between $60-$100 tops)

What is size of the stock muffler as I'll want the performance muffler
to match that size and curious as to what size is the piping from the
cat to the muffler inlet?

Thanks in advance

-MACE-