Metal vs rubber, both have pros and cons. Too many to list here. Installation is a big part of it. Barbed fittings for rubber and doubled flares for metal help a lot. And I will tell you what,got way more than 12 inches of rubber hose on a set of Hilborn stack injectors. At 120psi or so at high rpm. Those hoses have industrial style metal ends. Very durable and business like. Its all good when done properly.