Exhaust identity

[fazersharp]

YamFazFan, lower grade stainless can be magnetic, try some knives and forks, probably should be classed as rust resistant.

Thats right about the lower grade stainless sticking to a magnet but sometimes you can tell with a magnet that although it sticks, it is not so strong a stick/grab as plain steel is. Try a definite plain steel straight after to see if there is a difference.
To prove about some stainless being magnet, try some cheap kitchen sinks and you may find that the bowl won't stick but the drainer does.