tubular manifolds love to crack unless they are really high grade stuff, like welded iwth the pipes back flushed with shield gas using the proper rod with all the same grade of stianless for the parts (at the very least 304 or better). the head flange needs to have all the runners divorced so it can move around as it heats and the wall on the tube needs to be thick enough to fully support the turbo under these conditions. also it is going to dump more heat into the engine bay in a very tight area next to a bunch of stuff that doesn't like to get hot. This is why sets for the 350z cost upwards of $1600. Just throwing that out there.
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