Aluminum Intake Shipping Weight/Cost?

They fit in that game box flat rate USPS but the box bulges. Never had an issue mailing one that way.

Just a word of advice if using that game box - use heavy duty reinforced tape and tape it every way horizontally and vertically all the way around. If you don’t, it seems USPS don’t handle them too well. I sent a 66 cast iron 4 barrel to Leanna securely taped like that and still USPS managed to tear the box at one end. Luckily the loose fasteners that were in a ziplock bag made it without coming out. Disclaimer; Your experience may vary!