Does the ID of the vacuum hosed make a dramatic difference in vacuum? I want to replace my vacuum hoses with silicone hoses but the one I find at my speedshop have a ID that is smaller than the OE. The OD" is the same. TIA! 91 NX2000 with work. 97 Maxima SE, smooth and powerful automatic http://www.angelfire.com/ny/ianjiggyroom/IansNX2000page.html