Unfortunately, it is typical for 1G cars to end up with cracks in the exhaust manifold, O2 sensor housing and/or turbocharger housing. There is not much that can be done to prevent this, short of replacing original 1G manifolds or O2 housings with their more robust 2G counterparts. This is obviously not much of an option for the turbocharger, given the stock 2G turbo is smaller than the stock 1G turbo, and is obviously no help to 2G owners.
Short of replacement, sometimes the offending parts can be welded to close the cracks. This does not prevent them from cracking again, however. Unless you get a good deal on welding, it is probably best to simply replace the parts (preferably with upgraded parts). Those with cracked manifolds should know that many aftermarket exhaust headers also have significant problems with cracking.
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