Throttle body modification, often referred to as porting, involves reshaping and smoothing the internal surfaces of the throttle body. This procedure aims to optimize airflow through the intake system of an engine. For example, removing casting imperfections and enlarging the bore contribute to a less restrictive pathway for air entering the engine.
The process offers the potential to increase engine performance by improving volumetric efficiency. Enhanced airflow can lead to improved throttle response and increased horsepower, particularly at higher engine speeds. Historically, this modification has been a common practice among performance enthusiasts seeking to maximize engine output without major internal component changes.