muffler inlet/outlet measurements

I have a 1997 blazer 4 door 4x4 and was wondering what the measurements would be for the inlet/outlet on a new flowmaster or cherry bomb glasspack muffler for it. thanks.

Some people say they have 2.5" pipes, but mine are 2.25". Measure your''s to be sure.

2.25" offset in/center out is standard.  A lot of people, myself included, went to all 2.5" piping when redoing the exhaust system.

thanks guys. i appreciate the advise. ill post pics when i get the exhaust done.