I have a 93 civic si and was wondering if anybody knew the stock size of the outlet for the muffler. I am trying to install a custom exaust (muffler) and am generally getting very little info on the stock size for fitting a new muffler onto my civic. I think that i will be able to do it myself i just need to know the stock size for the muffler. ...... if anyone has any infoo on this or some suggestions please leave it

 

The outlet size or tips on most stock civic mufflers are about 1.75-2 inches in diameter, vs. like 4.5 inches for my N1's tip.