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The length doesn't HAVE to be 18".
However, if you want to quantify your results, you'll need some dyno time which is probably the biggest stressor on an older bike that you'll ever encounter. Of course you also need access to some nifty materials and equipment for custom intake fabrication.
You might try hunting down some existing manifolds for the job; I'd think that there are some out there to be found...
Dropping the tranny sprocket one tooth can have amazing results for a lot less money and effort.
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