i have a custom cat back on my forester.  have had it just under a year.  love the sound, however I'm wanting to downsize the tailpipe.  its a 4.5" tail with 2.5" piping.  i find it a bit too big, but also dont like that i can see the cone shape reduction on the outside of the pipe. 

2 questions.  i would like something more functional/rally looking, like group A wrx rally car.  (less shiny, more raw looking lol)  is it possible to just use exhaust piping as a tail pipe?

also it is possible to have a back box that has a 2.5 inlet, with a 3" outlet to avoid a noticeable reduction in the pipe?

 

cheers

Yes to the above