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exhaust manifold leak on 1998 BMW 740i

my car's check engine light is on, it smokes when it is first started or when pulling out from a redlight, i was told by one mechanic shop it was a intake manifold leak. any info greatly appreciated

Asked by for the 1998 BMW 740i
it could be your valve cover gaskets also, my 740i had the same problem and stpo when I fixed the valve cover gaskets