The exhaust ports needn't be as large as the intake ports to handle a given engine flow. Similar to the intake ports, these can be reshaped and smoothed to gain the most efficiency from the engine. With concern to intake and exhaust ports, bigger is not always better. Low end torque is often gained from maintaining high port flow velocity at low engine speeds. Too large a port slows the incoming charge and can somewhat negate this characteristic. For wide open throttle and power, larger ports may be better.