Hey Guys, I'm Replaciong The Cats On My 1999 E55 AMG, And You Guys Recomending Replace Them "with a nice set of 300-cell metal core cats and you will be set all for under $300 installed"...

That's Cool, And I'm Gonna Do It, But When I Went To Order, The Guy Needed To Know "What Size" Opening.

Does Anyone Know The Stats I Need To Get The Correct Cat Converter Replacements?

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You don't need 300cell cats. They won't improve performance and you can just install eastern cats or magna flow universal cats and achieve the same end result.2.25 inlet /outlet e55 might be 2.5 in/out just measure it's raining out and getting dark or I would go out and crawl under the wagon and measure the AMG pipes
If you are in California you are no go on either option so that is why I asked where you are.

magnaflows 53005 and eastern cats are about 50-60bucks each.

 

I'm In Vegas, So I'm Cool, But Which Magnaflow Do I Get, They Have Alot. I'm Cool With The Performance, I Just Want To Kill That Noice.

So What Steps Do I Take, Thos Other Ones Are Nice And Cost $95.00