SeriousBlack said:
so if I want to get a Borla universal, is this the size to get? this for both V6 and I4?
Well, you really aren't going to be able to put on a longer muffler. So basically 30" or less will fit.
Also, unless you're planning to custom fab some pipes, stick with the offset inlet/center outlet design. The muffler shop should have no problems cutting off the stocker and adding just the muffler on.
The muffler is the same for the I4 and V6.