304 to unknown stainless what wire

Thanks for the replies

It seams kind of strange though. Most high performance exhaust builders use the 304 or else 321 for racing turbo and sometimes Inconel for really extream turbo application. I have seen the 409 refered to at the cheap alloy the automotive industy came out with for production cars. Top exhaust builders dont even give 409 an honerable mension but some of the off the shelf low dollar headers are made with 409. But in any case

Thanks John R> Most stainless exhaust systems are made with the 400 series alloys and are

I did find more information on this topic as to why 304 is used over 409 by hot rod shops. The answer is 304 remains nice looking and 409 gets a surface corrosion after a while and looks ugly but will last longer. Now that I know this and looking at my mufferes and cat's it appeares that MB probably used 409 for all the pipes since they are non magnetic and have surface corosion. And they probably used a 300 series for the actual can since they are non magnetic and are still shinny.

Thanks for the info

John R> Most stainless exhaust systems are made with the 400 series alloys and are

I agree..if you can get your hands on "hastelloy W" use it.Your weld will be there forever.