it is possible to get "boost" without a supercharger/turbo or anyother f/i device, if a cars engine has a well designed intake and manifold it is posible to get a VE(volumatric efficiency) of over 100%. a VE of 100% means inside the cylinder pessure is the same as outside the the car, if a car can get say 105% VE it is said to be creating naturaly asperated boost, most of the time a cars VE is under 90% usualy around 80% and its peak is almost always at peak torque on a turbo or shupercharged car its VE is almost always over 100% exept when your driving off boost
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