My preheater hose went out on me, and I just bought a new one for a whopping 2 bucks. Cheapest part I have had to buy yet... Anyway, it made me wonder what would be the effect of not having one? I have the stock airbox with a K&N filter, but obviously with a 360 aircleaner, there would be no preheater hose, so it can't be too bad. With no hose do you have to close off the Manifold opening?