Patriot Exhaust M141200R Top Fueler Race Tuning EFI Controller for Harley Davidson Sportster / XR1200 2007-11 When adding a high-performance exhaust like the Patriot Defender, the Patriot Top Fueler helps your bike run cooler and take advantage of the available power increases Using load based technology, the Top Fueler works with your Harley-Davidson ECU to maintain proper fuel/air mixture for optimum power and efficiency Installs in your Harley without splicing or modifying your existing wiring or factory components Fail safe mode, should the Top Fueler ever fail, it will revert to the factory stock settings instead of leaving you stranded Not necessary to connect to a computer or use a dyno for tuning making installation and tuning completely user friendly