I have a black 1998 Nissan Maxima SE. I just put in a Place Racing CAI and am now looking into exhaust systems. I was just wondering what size piping I should get underneath that would give me a good deep sound but would not be too big and eliminate too much back pressure. I am thinking 2 and a half in to match the inlet of the muffler but just wanted to see what others thought.
Thanks-

 

2.5

 

You wouldnt need anything bigger than 2.5 unless you plan on boosting.