This is a Donaldson 5" round Muffler model # M100580
specs:
End Inlet/End Outlet/On Center
Inlet I.D.: 5.00 in.
Outlet I.D.: 5.00 in.
Body Diameter: 10.00 in.
Overall Length: 51.00 in.
bought this for my 05 dodge ram 2500 5.9L
when i bought the truck i was told it had a 5" exhaust but when my exhaust guy lifted the truck to install it we found out it was 4" tube. it was going to be too $$ to tear the entire system out so ive left it alone,
my loss your gain