Echo 450P Muffler mod. help

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hatfield

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My friend bought a 450P
He wants to open up the muffler a bit. Here's what it looks like. It seems there is a CAT. IMG_2206.JPG IMG_2208.JPG IMG_2209.JPG IMG_2210.JPG IMG_2212.JPG Any help would be appreciated. I tried a doing a search for a 450P. No luck.
Also, how do you remove the screen when you want to clean it. It seems to be underneath the steel opening of the muffler.
Thanks.
 
Forgot to add. How much should be removed or drilled on the deflector plate.
 
Does anyone have any suggestions on the best way to remove the CAT. As seen in the photos it's off center, so using a hole saw is not an option.
 
I've done several. Just remove a bunch of material from the plate surrounding the cat to let gasses bypass. Take as much as you can from the deflector to allow an open path.
 
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