6 Hvc, Professional Race With Fast Rev Limiter For Use In Circle Track And Professional Racing, With Fast Rev Limiter MSD IgnitionThe Fast Rev limiter is very quick and accurate compared to our Soft Touch Rev limiter. Professional race teams have been relying on the power and endurance of our 6 HVC Ignition Control. The advanced component design and circuitry of the 6 HVC Ignitions produce incredible voltage with high current output. Internally there is an efficient heat sync, solid component mounting and it's all encased in a clear epoxy. The rpm limit is adjustable with plug