31/2'' header outlet...need to adapt to a 3'' header flange ideas

Since i forgot it and im aware that most dont think about it,i should probably add that most of the time the reducers are measured Outside diameter at the outlet end and most aftermarket mufflers are measued Internal diameter so they should just slip together if you go this way.

I used to work with exhaust and there are millions of these little things that can make your life alitle easier and save you from extra work/parts and make a cleaner install:)