What grade stainless ?

[Flat on my back]

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Not that i know of, unfortunately, unless you have it delivered with a C of C.

[S2central.net]

Thanks for that... kinda confirms my findings so far, but tell me this - is there an easy way to determine if a lump of stainless steel is 303 or 304 without taking it for expensive lab tests ?

[Flat on my back]

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304 myself.

This gives you a good idea on the reasons.

http://www.stainlesssteel303.co.uk/

http://www.stainlesssteel304.co.uk/

[S2central.net]

Question for the metal experts - is stainless 303 suitable for an exhaust application ?

My understanding is that it is easier to machine than the normal 304 grade but that 303 is less resistant to corrosion. If the latter is true then I suppose a good high temp coating would maybe be wise.