Hey - are 205/40 16's pretty thin, or should I look for something thinner? I want somethign decently high profile, but nothing crazy.

And I believe the stock size of the inlet pipe on Civics is 2.5inches...so if I just get a muffler that has that size, it should fit right? And I take it I just take it to a muffler shop and they'll put it on for me?