Originally Posted by badwithcomputer
maybe i didn't give enough detail, i need a piece to put into the exhaust. basically i am cutting some out of the pipe so i will need the ends spread to match the size of the existing pipe for a nice tight fit. I would want the outer diameter of the existing pipe to match the inner diameter of the new pipe.
and that is why i need to know if that 2.25 is inner or outer
Well when I used to fab mine with elbows and pieces and u bolts the open end is wided already to the correct dia. you just gotta know what size it is your going to or coming from. So for example if you need a 45 elbow as long as it says 2.25 on it you got the right size pipe. If it says 2" or 1-7/8 those would be wrong sizes.
If you need a straight length just make sure it has a widen flange on both ends or you will need to mickey mouse a couple pieces together to get that.
There have been times when I only had a straight piece with no wide end and I had to hack saw a slot and pound it on. But that was back in my beater days.