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The deal with the shim is to raise the lower side which will in effect lower the higher side. A washer thickness will not be noticable as the engine stands in the compartment, but as you add length to the pipes it will change significantly at the cutouts. Simple task to just add one shim and take a look?
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20mph is not fast, unless you are doing it in a 3/2, 1000sq. ft. house on 10 ft. waves! 
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