The stock throttle body is undersized, which will reduce overall power gains. The OEM throttle body restricts airflow into the engine, which will prevent it from making more power. Increasing the diameter of the throttle body allows more air to flow into the cylinders which in turn can create more power. This is a bolt on mod and can be performed by anyone with basic mechanic skills and tools. This is a great all motor mod. We recommend doing it after you have already installed the essential bolt ons. Ie. Intake, header, exhaust, and flash pro. The ZDX throttle body is an OEM Honda product which ensures maximum reliability and quality. Not to mention the cost for a 80mm/70mm throttle body will rival that of any other option.