Its just normal air that the engine is sucking in. Generally a cold air intake will make it louder..least in my experience. Are u sure the car has a air silencer on it still?
Fiat Freak said:ACTUALLY, the sucking sound is the noise heard when the wallet in your pocket is being emptied of the green folding paper inside by the "excessive" consumption of petroleum bi-products.
Why don't we trade oil for food? Let's see those guys grow their own corn in that desert; or drink that oil instead of water for a while........and see just how quickly the price of a barrel comes down.