Upcharge Pipe efficiency
I understand the reasons to replace the OEM hose with metal tubing, but the change has some inherent disadvantages. The rubber hose helps insulate the air from the heat of the engine. Just has the intercooler is a radiator to cool the air, the 2.5' to 3' of metal tubing running in close proximity to the engine acts as a radiator to warm the air. It's something like running the A/C full blast on a warm summer day with the windows down. Notice the difference with the windows up? Wouldn't we increase the efficiency of the upcharge metal tubing by utilizing the OEM rubber by slitting it along its length and wrapping it around the metal tubing? Or if that doesn't work, acquire some rubber hose or heat resistant material to wrap the upcharge. Just a theory.
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