Ported manifold on boosted car

bullitt5897

The concept of porting is to increase the volumetric efficiency of the motor. By porting the intake manifold and or heads you are increasing the motors capacity to intake air and help with compression and then on the exhaust side to expel the gases.

By increasing the VE of the motor your hp/psi will increase.

Think of it this way... If porting the intake manifold makes more power n/a it will be drastically increased when put under higher pressures. Do note that modifying the plastic intake manifold could mean that it can't handle as much psi... This last statement is subjective but will also depend on how much material is removed and where from.

So short answer: porting the intake and exhaust allows the motor to work more freely and make more power.

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