exhaust

if i bought a obx muffler, what suze do i need to fit my eclipse gst stock piping for the inlet is it 2.5 or 3 inches, also do obx mufflers sound niice>? i dont want somthing gay on my car i just want it to sound good, but i want to also put 3" piping in about a week, so basiically i asked if i was to buy the obx muffler would i buy 2.5 or 3inches for my stock pipeing thanks guys