Had the code for years put a cheap cat on from Rock auto seems to have solved the problem. Kept the old cat my question is there any way of cleaning these? I read some where someone open one up and said the problem with his was that a piece of foam had come lose blocking the flow in the cat, might grind it open and have a look to see if that was the issue as well.

 

Yes there is! Many videos on YouTube about this exact thing.