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- BMW E21 320i, E36 "318IS" coupe
you ar ecorrect,the manifold isn't symmetrical but it's like that to allow for the offset of the left hand bank (of cylinders) to the right hand bank so the bigends sit next to each other on the crank pins. all the manifold mounting bolts line up fine so the ports must also.
i'm keen to get one of the US banana style manifolds now
for the right price you can buy mine if you want