Not to be an ass, but atmospheric pressure is 14.7 psi at sea level. 0 psi of boost pressure = 14.7 psi. At zero pounds of boost, you are running the same pressure inside the hose or pipe as you are outside the hose or pipe. The one true difference between running silicone reinforced with fiberglass filiaments and aluminum piping is that aluminum will invariably last a bit longer. Both can succumb to chaffing, if they come in close contact with anything steel or iron (Both materials are softer, and therefor would wear away if rubbing). You might experience the ever-most negligible boost drop when using a hose as opposed to a metal pipe, because hoses, yes even reinforced silicone hoses, do swell under pressure. The less pressure wasted in swelling hoses, the more pressure you apply to your cylinders in a timely fashion. Just my two cents...
John
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