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Long time member and reader on here, but never a great poster. Now on my second 350z and just landed a Gtm tt kit. But i cant find the fitting manuel anywhere.
I just had it welded in spring, so I cant give you any real data on how long they'll last. I know a few people have had tubular replacement manifolds made, so you could always go that route, I'm sure I'll be doing something like that at some point.
Tough break on the cracks. You can try getting it welded but with that many cracks it may be better to think long term and source some new manifolds. I know I've seen a few tubular replacement manifolds, maybe start asking around.