I recently purchased a 2008 F350 super duty. The truck came with the last section of the exhaust pipe broken off and I want to replace it with a new one.

I measured the diameter of the exhaust pipe using the string method to find the circumfrence (13") and dividing by pi (3.14). I come up with a diameter of 4 1/8".

All of the pipes I have found are 3 1/2" which I assume is the stock size and makes me think that this is an after-market exhaust system.

My question is this...who makes this size pipe and where can I purchase it?

Thanks in advance for any help!!