just buy something made for your legacy.
theres plenty of options, you dont need to hunt for an Impreza exhaust that will fit.
welcome to owning a subaru.
don't do things half assed or try to be cheap about it.
youll end up paying a lot more for it later in damages.
if youre going to change the exhaust, you need a tune
...or you will be changing the motor after your shit blows up from poorly modifying it.
i have invidia 3 inch turbo back, uppipe too.
everyone seems to like the sound of my exhaust.
i love it!
my car is running a protune, but i also have an accessport.
if you dont have enough spare cash to get everything at once, i suggest this:
first buy a cobb accessport, marry it to your car and flash stage 1. (i assume youre 100% stock now) ride that around for a bit.
then when you get more cash buy a downpipe and you can flash to stage 2.
then you can get the back half of the exhaust later and the up pipe too.
take your time, do it right.