There is a large flat rate box for the post office that can fit a slant 6 intake or exhaust manifold (not both together)... If your local post office doesn't carry them, they can be ordered and they will ship you a bundle and you can use them if you need them, or take what you need and give the extra to your local post office for them to give to anyone that may need one...
I've shipped slant 6 intakes in them for $25 with insurance, tracking, and signature required....
It may help you reach a larger audience....
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