92 4x4 22re. It's bigger than 1-1/2", smaller than 1-3/4", and a shade bigger than 1-5/8". I don't think they use metric measurement with exhaust do they? My tip rusted and broke off and I'm trying to replace it. I've been back and forth to the parts shop three times today and it looks like I'm going back for #4

 

Circumfrence = pi x diameter OR C = pi x d

So measure around the pipe and divide by pi (3.14 or 22/7) and you should have your answer.