How much HP will running my raptor 700 gain by removing the air box lid?

Removing the airbox lid on a Yamaha Raptor 700 can increase horsepower by improving airflow to the engine. While the exact gain can vary based on other modifications and tuning, riders often report an increase of around 2 to 5 horsepower. However, it’s important to complement this change with appropriate tuning and possibly an aftermarket exhaust for the best results. Always consider potential impacts on engine reliability and performance.