ThunderMax is Performance!

ThunderMax® is the most powerful, self-tuning fuel management system designed specifically for fuel injected Harley-Davidson® motorcycles. ThunderMax® is an industry award winning product that outperforms all other aftermarket tuning systems in the industry. Whether you ride a stock injected Harley®, or are considering performance upgrades like pipes, free breathing intake, cams, or other aftermarket parts, ThunderMax® will continually your engine for maximum performance.