Hi, everybody, Well I'm new to this forum, but I truly need some help. Well I have a 1991 Honda Civic Sedan LX, 1.5 Litre Engine. Does anybody know the size of the exhaust on this vehicle, on the back of my cat there is a flange that connects the exhaust pipe, well that flange broke from the exhuast pipe and is the bolts are pretty rusted on the cat, I was wondering the size of the exhaust pipe outside diameter and the inside diameter of the same pipe, as I want to put a reducer inside the remaining pipe of the cat and over the exhaust to join them back together without buying half the exhaust system. If anybody knows please let me know what size reducer I should get to achive this odd fix. Thanks ~Kevin