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Metal Guru
Join Date: May 2001
Location: Beverly Hills, Michigan
Posts: 2,526
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Most aftermarket systems for our cars (the exception being the Rarlyl8 system, built from 321 stainless; there may be others that I'm not aware of) are constructed from 304 stainless, which is prone to cracking in "hot end" exhaust applications. No OEM's use 304 in the hot end (defined as from engine to cat). The material of choice is 409 ferritic stainless for automotive applications, or 321 stainless for aircraft applications.
Re-welding 304 will result in re-cracking in the future.
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Paul B.
'91 964 3.3 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb
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