I did it to mine just for the sound, turbos don't need the cross over but I figure if it deepens the tone on a NA car why not, plus if need a be can always remove that rear portion and add dumps where they connect for race day.
Mine qalready dumps , I got the 3 1/2'' set up really cheap on e bay, guess no one wanted it . Havent been able to tell any diff. in anything tho really.
