Various grades of steel are used in exhaust systems. According to wiki, the steel grade generally used for exhaust sytems is:
"Type 409—cheapest type; used for automobile exhausts; ferritic (iron/chromium only)."
whilst "Type 439—ferritic grade, a higher grade version of 409 used for catalytic converter exhaust sections. Increased chromium for improved high temperature corrosion/oxidation resistance."
But as you may know there are 10's of differing grades of steel with differing properties and depending on the cost of a "stainless steel" system they could be using a number of types. Powerflow advertise that their exhaust "tips" are made from T-304. Double "S" uses three main types of stainless steel - Type 409 (Ferritic), Type 304 (Austenitic) and Type 316.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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