I just bought some Dynomax 2 1/2 tubing to use with the new
downpipe (describer in a previous post) in a free flow exhaust.

The catalog said it was stainless steel pipe, but when it
arrived it looked just like regular aluminized stuff. The
tubing has that "metal flake" look. Only difference from
aluminized is that it is perhaps a tiny bit darker.
The grade of SS was not specified. It doesn't look at all like
polished T304. It's magnetic, but some SS is.

I was majorly P'ed and was going to refuse it but the guy
who ordered it for me called Dynomax and they maintained that it
is indeed SS steel. Do you think I'm just getting BS'ed?

The mandrel bending was quite nice and smooth, but the dimensions
were not exactly as specified. Bend diameter was about 1" off.
I think it will still work dimensionwise though.

Thanks for any insights,
Martin