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T309 (25 chromium, 13 nickel) and T310 (25 chromium, 20 nickel) offer the maximum resistance to oxidation and corrosion. They also offer good high-temperature properties.
T400 class is lower in chromium and nickle. It is hard to form a 400 class or draw and bend without warping or roping. The 400 class is more found in flat formed such as heat shields.
So, T409 is used by lower class manufacturing companies that do not offer a high end product.
I suppose the flames are gonna come flying now.......
electod here 2005 250 6.0 4x4 4dr just installed volant airbox noticable increase in the way the engine revs did pick up some pickup and around 2 mpg, would like to change exhaust looking to magnaflow or mbrp, will these mods help will dead stop pickup or will i have to install some sort of tuner