It's in the gas tank
Needs a muffler.
57 buick I think
Take the old one and compare them
Well first all you have 2 one is an outer change that first the other is in gas tank
If you are giving him a lot of canned food cut that back and see if that helps make sure you have him wormed and up to date on all shots
My ultra sound I just had said I have fatty deposits in my liver I have to go for further testing my liver enzymes have ran high thats why I had the test