Cracked Exhaust Manifold on 1991 Toyota Corolla

Where can I find an exhaust manifold for a Model 4A-FE, 4 cylinder, 1.5 liter Toyota Corolla engine...don't want to pay for new and mine has a crack...will it affect the results of a smog test if I wait to get it fixed?

Replacing the exhaust manifold is about 1.2 to 1.5 hours to replace. Several companies make aftermarket exhaust manifolds (a company called Dorman being one). Napa or any parts store sell them. Any independent repair shop in your area should be able to replace it for you it is not a high skill level job.
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at the salvage yards they will be the cheapist