Each kit is within a 1,000 rpm range. For example, the PN 8745 is supplied with: 5,000, 5,200, 5,400, 5,600, 5,800 modules.
MSD 8744 4000 Series Module Kit, Even Increments
MSD 87441 4000 Series Module Kit, Odd Increments
MSD 8744 RPM Module Kit, 4000 Series @ Speed Tech
MSD Performance 8744 Module Kit 4000 Series Even Increments
MSD 8744 RPM Modules 4000 Series Kit, Even Increments
