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Whats diff between 409SS and other types. Maybe I could ASK TTI if they can duplicate thier headers outta SS.
I'll contact them today.
Wonder what wall thickness?
400 series stainless is magnetic. it gets it's corrosion resistance from high chromium content, IIRC. it has good workability, weldability. most OEM exhaust systems on cars since the late early 90's are 400 series stainless. the Y pipe on my 5th ave ('86) was 409, had a coat of surface corrosion on it, but still solid as a rock when I took it to the metal recyclers in '07...car spent it's life either in michigan or on the california shore, so it had a fair amount of salt exposure.
300 series stainless is non-magnetic, gets most of it's corrosion resistance from high nickel content. it's more expensive, can be polished, bends ok (not as good as 400 series), somewhat susceptible to thermal fatigue--cracks can develop in welds with lots of thermal cycling, much pricier than 400 series
granted it's not as pretty, but I prefer 400 series for exhaust work. it's cheaper and more resistant to thermal fatigue. it can be ceramic coated if you want it pretty.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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