BBR Motorsports Rev Box 451-HCF-1501 High-performance CDI unit Honda models feature an advanced power curve with the rev-limiter eliminated Kawasaki/Suzuki models feature an advanced power curve with the rev-limiter raised by 1,200 rpm Yamaha models feature an advanced power curve with the rev-limiter raised by 1,000 rpm Great add-on for bore kits and other performance modifications