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FWIW, I've had the SSA bottom-mount T2-flanged manifold on my car for a year and a half without even the slightest problem. The car sees some daily driving, but it is primarily a track car. It has been through some pretty severe conditions (track-days with 115+ ambient air temp), and held-up just fine.

From my experience, all tube manifolds crack eventually. I've seen cracks in a stainless manifold that was built by a guy who has built IndyCar manifolds for Burns Stainless.

This manifold has lasted long enough, and was cheap enough, that if it cracked now I would probably buy another one to replace it.