Originally posted by Stazi: Note: 304 and 304L are both slightly magnetic, which can be relieved after heating, so once they been run on a car above 700�°C they'll lose magnetism. The 304L is lower carbon 0.03% vs 0.15% for regular 304. The lower carbon in the 304L is better for welding (due to a lower precipitation of carbides). 304L is softer (Brinell 140) than 304 (Brinell 150) by a smidge and also has a lower tensile stregth of 80ksi vs 85ksi.
304 or 316 SS is barely magnetic....409 SS is damn near like normal mild steel in magnetism. 304 or 316 SS is very easy to weld...even 409 is easy to weld.
I would still rather have a coated header inside and out like mine to help dissipate the heat out of the engine bay. My car ran much cooler when I installed my headers compared to the stock manifolds.
yes Greg the poor weld quality on the outside could still have good penetration/ interior weld quality. BUt I highly doubt that inless they back purged the welds and had excellent fitment priot to welding. And considering MIG weldings inability to penetrate the base metals and only fuse on top. I'm not impressed by weapon rices attempts.
06 GMC Sierra 2500HD Dmax/ally
06 Pontiac G6 GT
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