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[Naturally Aspirated]. Used in many gran turismo games. A way of making your car faster and overall better performing than stock, without super or turbo chargers. To do this "tune-up", many things can work, lighter parts for the engine and a lighter block. Also increasing compression (ratio of volume in cylinders when at the down stroke compared to the volume at the top of [the stroke]. Cam shafts with larger domes to hold the valves open longer. High output injetion or carb and also thinner head gaskets and much more. A more costly way of improving [performance], but with great return. For ways of increasing power and making your car a weed eater all in one, see NOS .
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