| All it does is gives people a warm fuzzy feeling cause they have a nice alloy extrusion u can see. The bore size on the 300 degree rail is much the same size as the stock rail, and the border isnt much different. So why even bother The other reason you should stick to stock ( unless you have BIG power 350-400kw) is that the fuel rail is thermally islolated from the lower plenum. AFAIK both those other rails are not meaning they run hotter. Running hotter fuel should be avoided.
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