MSD Engine RPM Limiter Pill Module 87431; RPM Modules 3,100 to 3,900 RPM

87431 MSD RPM Modules - 3000 Series Kit - Odd Increments

MSD 87431 (5-Pack) RPM Module Chip 3100-3900RPM 200RPM Increments Odd

8743 MSD RPM Modules - 3000 Series Kit - Even Increments

87431 MSD Ignition RPM Module Kit

8746 6000 Series Module Kit, Even Increments

MSD 87431 3000 Series Kit of RPM Modules - Odd Increments

8745 MSD RPM Modules - 5000 Series Kit - Even Increments